Fix crash in fingerprint settings when rotating

Fragments always need empty constructors.

Bug: 23806551
Change-Id: Ib22a89be60f799d70caf1acf2ac95a20e6be9675
diff --git a/src/com/android/settings/fingerprint/FingerprintSettings.java b/src/com/android/settings/fingerprint/FingerprintSettings.java
index 43c1e76..d9ec38d 100644
--- a/src/com/android/settings/fingerprint/FingerprintSettings.java
+++ b/src/com/android/settings/fingerprint/FingerprintSettings.java
@@ -528,7 +528,6 @@
 
         public static class RenameDeleteDialog extends DialogFragment {
 
-            private final Context mContext;
             private Fingerprint mFp;
             private EditText mDialogTextField;
             private String mFingerName;
@@ -536,10 +535,6 @@
             private int mTextSelectionStart;
             private int mTextSelectionEnd;
 
-            public RenameDeleteDialog(Context context) {
-                mContext = context;
-            }
-
             @Override
             public Dialog onCreateDialog(Bundle savedInstanceState) {
                 mFp = getArguments().getParcelable("fingerprint");
@@ -562,7 +557,7 @@
                                             if (DEBUG) {
                                                 Log.v(TAG, "rename " + name + " to " + newName);
                                             }
-                                            MetricsLogger.action(mContext,
+                                            MetricsLogger.action(getContext(),
                                                     MetricsLogger.ACTION_FINGERPRINT_RENAME,
                                                     mFp.getFingerId());
                                             FingerprintSettingsFragment parent
@@ -607,7 +602,7 @@
 
             private void onDeleteClick(DialogInterface dialog) {
                 if (DEBUG) Log.v(TAG, "Removing fpId=" + mFp.getFingerId());
-                MetricsLogger.action(mContext, MetricsLogger.ACTION_FINGERPRINT_DELETE,
+                MetricsLogger.action(getContext(), MetricsLogger.ACTION_FINGERPRINT_DELETE,
                         mFp.getFingerId());
                 FingerprintSettingsFragment parent
                         = (FingerprintSettingsFragment) getTargetFragment();