Rename java WebContentsObserverAndroid to WebContentsObserver

chrome/android/java/src/org/chromium/chrome/browser/VoiceSearchTabHelper.java

 // Copyright 2014 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;
 
-import org.chromium.content.browser.WebContentsObserverAndroid;
+import org.chromium.content.browser.WebContentsObserver;
 import org.chromium.content_public.browser.WebContents;
 
 /**
  * Tab helper to toggle media autoplay for voice URL searches.
  */
-public class VoiceSearchTabHelper extends WebContentsObserverAndroid {
+public class VoiceSearchTabHelper extends WebContentsObserver {
     private final WebContents mWebContents;
 
     /**
      * Create an instance of VoiceSearchTabHelper.
      *
      * @param webContents WebContents to update media autoplay status.
      */
     public VoiceSearchTabHelper(WebContents webContents) {
         super(webContents);
         mWebContents = webContents;
     }
 
     @Override
     public void navigationEntryCommitted() {
         nativeUpdateAutoplayStatus(mWebContents);
     }
 
     private native void nativeUpdateAutoplayStatus(WebContents webContents);
 }