[Android] Sync location access permmission change when going back to the search engine setting page

Force Listview to update in onResume() to synchronize with any change of
location access permission of search engines.

BUG=652204

Review-Url: https://codereview.chromium.org/2390113002
Cr-Commit-Position: refs/heads/master@{#422827}

chrome/android/java/src/org/chromium/chrome/browser/preferences/SearchEnginePreference.java

@@ -102,4 +102,13 @@ public class SearchEnginePreference extends PreferenceFragment
             updateBottombarDivider();
         }
     }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        /**
+         * Handle UI update when location setting for a search engine is changed.
+         */
+        mSearchEngineAdapter.notifyDataSetChanged();
+    }
 }