Change the CBD dialog on Android to a PreferenceFragment

chrome/android/java/src/org/chromium/chrome/browser/sync/ui/ClearSyncDataDialogFragment.java

Index: chrome/android/java/src/org/chromium/chrome/browser/sync/ui/ClearSyncDataDialogFragment.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/sync/ui/ClearSyncDataDialogFragment.java b/chrome/android/java/src/org/chromium/chrome/browser/sync/ui/ClearSyncDataDialogFragment.java
index 14ad82c823ccbc679471ff9a32a9f760663bf7ba..c9c09f349a9f941bb49f0ace45cf020c1e6ecd34 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/sync/ui/ClearSyncDataDialogFragment.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/sync/ui/ClearSyncDataDialogFragment.java
@@ -20,6 +20,12 @@ public class ClearSyncDataDialogFragment extends ClearBrowsingDataDialogFragment
     private Context mApplicationContext;
 
     @Override
+    public void onAttach(Context context) {

[msramek, 2016/01/28 18:43:49]

onAttach(Activity activity) is deprecated, and onAttach(Context context) is the
replacement. However, this is a recent change - on Lollipop, only
onAttach(Activity activity) is called.

I left both versions for compatibility, but I'm not sure what is the correct
approach in this case. I expect that we do want to still support Lollipop?

+        super.onAttach(context);
+        mApplicationContext = context;
+    }
+
+    @Override
     public void onAttach(Activity activity) {
         super.onAttach(activity);
         mApplicationContext = activity.getApplicationContext();