Change to import android.app.AlertDialog instead of androidx.appcompat.app.AlertDialog.

There are two kind of AlertDialog(android.app.AlertDialog and androidx.appcompat.app.AlertDialog) in the app.
The UI of androidx.appcompat.app.AlertDialog looks abnormal. Seems because we didn't(can't) apply appcompat theme.
For fixing the abnormal UI of the dialog and being consistent the type of AlertDialog in the app, convert androidx.appcompat.app.AlertDialog to android.app.AlertDialog.

Screenshots:
  Old:
    https://screenshot.googleplex.com/96tKu6mHvyAdA9P.png
    https://screenshot.googleplex.com/9BFYQYs8i4J3qPp.png
    https://screenshot.googleplex.com/BCG2ukSCS6AsgLX.png
    https://screenshot.googleplex.com/4UD5xg6DHa6QFJp.png
  New:
    https://screenshot.googleplex.com/8KMuw8YQZkScmVS.png
    https://screenshot.googleplex.com/6bZAzZZZh7xgDyz.png
    https://screenshot.googleplex.com/6kfUNWe7cLiBpr9.png
    https://screenshot.googleplex.com/8AiemAFErJyr4Wt.png

Bug: 169024462
Change-Id: I0dd005ae708579cdae67425d4d9692743de31e2b
diff --git a/src/com/android/wallpaper/picker/CategoryFragment.java b/src/com/android/wallpaper/picker/CategoryFragment.java
index 42566eb..a90acc9 100755
--- a/src/com/android/wallpaper/picker/CategoryFragment.java
+++ b/src/com/android/wallpaper/picker/CategoryFragment.java
@@ -19,6 +19,7 @@
 import static com.google.android.material.bottomsheet.BottomSheetBehavior.STATE_EXPANDED;
 
 import android.app.Activity;
+import android.app.AlertDialog;
 import android.app.WallpaperColors;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ -39,7 +40,6 @@
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.appcompat.app.AlertDialog;
 import androidx.cardview.widget.CardView;
 import androidx.constraintlayout.widget.ConstraintLayout;
 import androidx.fragment.app.Fragment;
diff --git a/src/com/android/wallpaper/picker/CategorySelectorFragment.java b/src/com/android/wallpaper/picker/CategorySelectorFragment.java
index 887eb92..bb5d3d2 100644
--- a/src/com/android/wallpaper/picker/CategorySelectorFragment.java
+++ b/src/com/android/wallpaper/picker/CategorySelectorFragment.java
@@ -16,6 +16,7 @@
 package com.android.wallpaper.picker;
 
 import android.app.Activity;
+import android.app.AlertDialog;
 import android.content.Intent;
 import android.graphics.Point;
 import android.graphics.PorterDuff;
@@ -34,7 +35,6 @@
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.appcompat.app.AlertDialog;
 import androidx.cardview.widget.CardView;
 import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.GridLayoutManager;
diff --git a/src/com/android/wallpaper/picker/LoadWallpaperErrorDialogFragment.java b/src/com/android/wallpaper/picker/LoadWallpaperErrorDialogFragment.java
index 0d9e9af..603d931 100755
--- a/src/com/android/wallpaper/picker/LoadWallpaperErrorDialogFragment.java
+++ b/src/com/android/wallpaper/picker/LoadWallpaperErrorDialogFragment.java
@@ -15,6 +15,7 @@
  */
 package com.android.wallpaper.picker;
 
+import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
@@ -22,7 +23,6 @@
 import com.android.wallpaper.R;
 
 import androidx.annotation.NonNull;
-import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.DialogFragment;
 
 /**
diff --git a/src/com/android/wallpaper/picker/SetWallpaperDialogFragment.java b/src/com/android/wallpaper/picker/SetWallpaperDialogFragment.java
index 00772c9..4ed2e13 100755
--- a/src/com/android/wallpaper/picker/SetWallpaperDialogFragment.java
+++ b/src/com/android/wallpaper/picker/SetWallpaperDialogFragment.java
@@ -15,6 +15,7 @@
  */
 package com.android.wallpaper.picker;
 
+import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -24,7 +25,6 @@
 
 import androidx.annotation.NonNull;
 import androidx.annotation.StringRes;
-import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.view.ContextThemeWrapper;
 import androidx.fragment.app.DialogFragment;
 
diff --git a/src/com/android/wallpaper/picker/SetWallpaperErrorDialogFragment.java b/src/com/android/wallpaper/picker/SetWallpaperErrorDialogFragment.java
index 89a7d02..b484d1a 100755
--- a/src/com/android/wallpaper/picker/SetWallpaperErrorDialogFragment.java
+++ b/src/com/android/wallpaper/picker/SetWallpaperErrorDialogFragment.java
@@ -16,6 +16,7 @@
 package com.android.wallpaper.picker;
 
 import android.app.Activity;
+import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
@@ -23,7 +24,6 @@
 import com.android.wallpaper.R;
 import com.android.wallpaper.module.WallpaperPersister.Destination;
 
-import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.DialogFragment;
 import androidx.fragment.app.Fragment;
 
diff --git a/src/com/android/wallpaper/picker/StartRotationErrorDialogFragment.java b/src/com/android/wallpaper/picker/StartRotationErrorDialogFragment.java
index 9f98b70..d8f67c1 100755
--- a/src/com/android/wallpaper/picker/StartRotationErrorDialogFragment.java
+++ b/src/com/android/wallpaper/picker/StartRotationErrorDialogFragment.java
@@ -15,6 +15,7 @@
  */
 package com.android.wallpaper.picker;
 
+import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
@@ -23,7 +24,6 @@
 import com.android.wallpaper.model.WallpaperRotationInitializer.NetworkPreference;
 
 import androidx.annotation.NonNull;
-import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.DialogFragment;
 
 /**
diff --git a/src/com/android/wallpaper/picker/TopLevelPickerActivity.java b/src/com/android/wallpaper/picker/TopLevelPickerActivity.java
index 8e667cb..f74a445 100755
--- a/src/com/android/wallpaper/picker/TopLevelPickerActivity.java
+++ b/src/com/android/wallpaper/picker/TopLevelPickerActivity.java
@@ -16,6 +16,7 @@
 package com.android.wallpaper.picker;
 
 import android.app.Activity;
+import android.app.AlertDialog;
 import android.app.ProgressDialog;
 import android.content.Context;
 import android.content.Intent;
@@ -41,7 +42,6 @@
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.widget.Toolbar;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;