Revert of Changes to enable HTML5 autoplay for voice search.

chrome/browser/android/voice_search_tab_helper.cc

-// Copyright 2013 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.
-
-#include "chrome/browser/android/voice_search_tab_helper.h"
-
-#include "chrome/browser/google/google_util.h"
-#include "content/public/browser/render_view_host.h"
-#include "content/public/browser/web_contents.h"
-#include "jni/VoiceSearchTabHelper_jni.h"
-#include "webkit/common/webpreferences.h"
-
-using content::WebContents;
-
-// Register native methods
-bool RegisterVoiceSearchTabHelper(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
-static void UpdateAutoplayStatus(JNIEnv* env,
-                                 jobject obj,
-                                 jobject j_web_contents) {
-  WebContents* web_contents = WebContents::FromJavaWebContents(j_web_contents);
-  content::RenderViewHost* host = web_contents->GetRenderViewHost();
-  WebPreferences prefs = host->GetWebkitPreferences();
-  prefs.user_gesture_required_for_media_playback =
-      !google_util::IsGoogleSearchUrl(web_contents->GetLastCommittedURL());
-  host->UpdateWebkitPreferences(prefs);
-}