Bug 838398 - Make sure SyncType.onDestroy() is called when AboutHomePromoBox is removed. r=mfinkle

--HG--
rename : services/sync/tests/unit/test_utils_json.js => services/common/tests/unit/test_utils_json.js
extra : rebase_source : 4e9db7d7954d9138776bcfc1812764dcfa7bc989

mobile/android/base/AboutHomePromoBox.java

@@ -50,6 +50,14 @@ public class AboutHomePromoBox extends TextView implements View.OnClickListener
             return true;
         }
         public void onClick(View v) { }
+        public void onDestroy() { }
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        for (Type type : mTypes) {
+            type.onDestroy();
+        }
     }
 
     private class SyncType extends Type {
@@ -75,6 +83,7 @@ public class AboutHomePromoBox extends TextView implements View.OnClickListener
             context.startActivity(intent);
         }
 
+        @Override
         public void onDestroy() {
             if (mAccountListener != null) {
                 AccountManager.get(mContext).removeOnAccountsUpdatedListener(mAccountListener);