Clear webapp storage when site data is cleared

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
index 37511a3ccab40c6e2f30e3e24c989cb5a3750a48..58e442e020cc1e4061bd245f496ee87965040634 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
@@ -86,11 +86,21 @@ public class WebappDataStorage {
         sFactory = factory;
     }
 
-    protected WebappDataStorage(Context context, String webappId) {
-        mPreferences = context.getApplicationContext().getSharedPreferences(
+    /** Package private for use by WebappRegistry */
+    static void delete(final Context context, final String webappId) {

[mlamouri (slow - plz ping), 2015/09/08 10:03:00]

Shouldn't you add some method comments?

[Lalit Maganti, 2015/09/08 10:44:28]

I didn't because they are package private. I guess I could add some comment for
this method.

Done.

+        assert !ThreadUtils.runningOnUiThread();
+        openSharedPreferences(context, webappId).edit().clear().commit();
+    }
+
+    private static SharedPreferences openSharedPreferences(Context context, String webappId) {
+        return context.getApplicationContext().getSharedPreferences(
                 SHARED_PREFS_FILE_PREFIX + webappId, Context.MODE_PRIVATE);
     }
 
+    protected WebappDataStorage(Context context, String webappId) {
+        mPreferences = openSharedPreferences(context, webappId);
+    }
+
     /*
      * Asynchronously retrieves the splash screen image associated with the
      * current web app.