Speculative fixes for search engine crashes.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.preferences;
 
 import android.os.Bundle;
 import android.preference.PreferenceFragment;
 import android.view.ViewGroup.MarginLayoutParams;
 import android.widget.ListView;
@@ skipping 38 matching lines @@
         int marginTop = getActivity().getResources().getDimensionPixelSize(
                 R.dimen.search_engine_list_margin_top);
         MarginLayoutParams layoutParams = (MarginLayoutParams) mListView.getLayoutParams();
         layoutParams.setMargins(0, marginTop, 0, 0);
         mListView.setLayoutParams(layoutParams);
         mListView.setAdapter(mSearchEngineAdapter);
         mListView.setDivider(null);
     }
 
     @Override
-    public void onResume() {
-        super.onResume();
-        /**
-         * Handle UI update when location setting for a search engine is changed.
-         */
-        mSearchEngineAdapter.notifyDataSetChanged();
+    public void onStart() {
+        super.onStart();
+        mSearchEngineAdapter.start();
+    }
+
+    @Override
+    public void onStop() {
+        super.onStop();
+        mSearchEngineAdapter.stop();
     }
 }