[ObjC ARC] Converts ios/public/provider/chrome/browser/voice:voice to ARC.

ios/public/provider/chrome/browser/voice/voice_search_controller.mm

 // Copyright 2012 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.
 
 #import "ios/public/provider/chrome/browser/voice/voice_search_controller.h"
 
 #import <UIKit/UIKit.h>
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 VoiceSearchController::VoiceSearchController() {}
 
 VoiceSearchController::~VoiceSearchController() {}
 
 void VoiceSearchController::SetDelegate(
     id<VoiceSearchControllerDelegate> delegate) {}
 
 void VoiceSearchController::PrepareToAppear() {}
 
 void VoiceSearchController::StartRecognition(
@@ skipping 10 matching lines @@
 
 bool VoiceSearchController::IsVisible() {
   return false;
 }
 
 bool VoiceSearchController::IsPlayingAudio() {
   return false;
 }
 
 void VoiceSearchController::DismissMicPermissionsHelp() {}