Remove unneeded JNI registrations.

chrome/browser/android/voice_search_tab_helper.cc

 // 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.
 
-#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();
 
   // In the case where media autoplay has been enabled by default (e.g. in
   // performance media tests) do not update it based on navigation changes.
   //
   // Note that GetWekitPreferences() is 'stateless'. It returns the default
   // webkit preferences configuration from command line switches.
   if (!prefs.user_gesture_required_for_media_playback)
     return;
 
   prefs.user_gesture_required_for_media_playback =
       !google_util::IsGoogleSearchUrl(web_contents->GetLastCommittedURL());
   host->UpdateWebkitPreferences(prefs);
 }