Bug 732901 - Use notifyDatasetChanged() to update view after modifying mTabsAdapter. r=sriram

mobile/android/base/TabsTray.java

@@ -163,8 +163,7 @@ public class TabsTray extends GeckoActivity implements Tabs.OnTabsChangedListene
         if (Tabs.getInstance().getIndexOf(tab) == -1) {
             mWaitingForClose = false;
             mTabsAdapter.removeTab(tab);
-            mList.invalidateViews();
-            mListContainer.requestLayout();
+            mTabsAdapter.notifyDataSetChanged();
         } else {
             View view = mList.getChildAt(position - mList.getFirstVisiblePosition());
             if (view == null)
@@ -344,13 +343,5 @@ public class TabsTray extends GeckoActivity implements Tabs.OnTabsChangedListene
 
             return convertView;
         }
-
-        @Override
-        public void notifyDataSetChanged() {
-        }
-
-        @Override
-        public void notifyDataSetInvalidated() {
-        }
     }
 }