Unregister from network changes on destroy in ContextualSearchTabHelper

chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchTabHelper.java

 // Copyright 2015 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.contextualsearch;
 
 import android.app.Activity;
 import android.view.ContextMenu;
 
 import org.chromium.base.annotations.CalledByNative;
@@ skipping 100 matching lines @@
 
     @Override
     public void onDestroyed(Tab tab) {
         if (mNativeHelper != 0) {
             nativeDestroy(mNativeHelper);
             mNativeHelper = 0;
         }
         if (mTemplateUrlObserver != null) {
             TemplateUrlService.getInstance().removeObserver(mTemplateUrlObserver);
         }
+        if (NetworkChangeNotifier.isInitialized()) {
+            NetworkChangeNotifier.removeConnectionTypeObserver(this);
+        }
         removeContextualSearchHooks(mBaseContentViewCore);
         mBaseContentViewCore = null;
     }
 
     @Override
     public void onToggleFullscreenMode(Tab tab, boolean enable) {
         ContextualSearchManager manager = getContextualSearchManager();
         if (manager != null) {
             manager.hideContextualSearch(StateChangeReason.UNKNOWN);
         }
@@ skipping 129 matching lines @@
         if (manager != null) {
             boolean isEnabled = !PrefServiceBridge.getInstance().isContextualSearchDisabled()
                     && !PrefServiceBridge.getInstance().isContextualSearchUninitialized();
             manager.onContextualSearchPrefChanged(isEnabled);
         }
     }
 
     private native long nativeInit(Profile profile);
     private native void nativeDestroy(long nativeContextualSearchTabHelper);
 }