Enable HTMLMediaElement@autoplay on Android

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_public.browser.WebContents;
-
-/**
- * Tab helper to toggle media autoplay for voice URL searches.
- */
-public class VoiceSearchTabHelper extends WebContentsObserverAndroid {
-    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);
-}