Remove unused import statements

Also added preupload hooks to prevent this in the future.

Bug: 169712334
Test: Compiling
Change-Id: Ieaa6914306cd706fce091020bbb48769551e4550
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
new file mode 100644
index 0000000..38f9800
--- /dev/null
+++ b/PREUPLOAD.cfg
@@ -0,0 +1,7 @@
+[Hook Scripts]
+checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --sha ${PREUPLOAD_COMMIT}
+ktlint_hook = ${REPO_ROOT}/prebuilts/ktlint/ktlint.py -f ${PREUPLOAD_FILES}
+
+[Builtin Hooks]
+commit_msg_changeid_field = true
+commit_msg_test_field = true
diff --git a/src/com/android/car/media/GuidelinesUpdater.java b/src/com/android/car/media/GuidelinesUpdater.java
index 79773ea..e12ba84 100644
--- a/src/com/android/car/media/GuidelinesUpdater.java
+++ b/src/com/android/car/media/GuidelinesUpdater.java
@@ -16,7 +16,6 @@
 
 package com.android.car.media;
 
-import android.app.Activity;
 import android.view.View;
 
 import androidx.annotation.NonNull;
@@ -24,7 +23,6 @@
 
 import com.android.car.ui.baselayout.Insets;
 import com.android.car.ui.baselayout.InsetsChangedListener;
-import com.android.car.ui.core.BaseLayoutController;
 
 import java.util.HashSet;
 import java.util.Set;