[ObjC ARC] Converts ios/chrome/browser/voice:unit_tests to ARC.Automatically generated ARCMigrate…

ios/chrome/browser/voice/text_to_speech_parser_unittest.mm

 // Copyright 2015 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 <Foundation/Foundation.h>
 
 #import "ios/chrome/browser/voice/text_to_speech_parser.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "third_party/google_toolbox_for_mac/src/Foundation/GTMStringEncoding.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // Expose internal parser function for testing.
 NSData* ExtractVoiceSearchAudioDataFromPageHTML(NSString* pageHTML);
 
 namespace {
 NSString* const kValidVoiceSearchHTML =
     @"<script>(function(){var _a_tts='dGVzdGF1ZG8zMm9pbw==';var _m_tts= {}}";
 NSString* const kInvalidVoiceSearchHTML = @"no TTS data";
 }  // namespace
 
 TEST(TextToSpeechParser, ExtractAudioDataValid) {
   NSData* result =
       ExtractVoiceSearchAudioDataFromPageHTML(kValidVoiceSearchHTML);
 
   EXPECT_TRUE(result != nil);
 
   GTMStringEncoding* base64 = [GTMStringEncoding rfc4648Base64StringEncoding];
   NSData* expectedData = [base64 decode:@"dGVzdGF1ZG8zMm9pbw==" error:nullptr];
   EXPECT_TRUE([expectedData isEqualToData:result]);
 }
 
 TEST(TextToSpeechParser, ExtractAudioDataNotFound) {
   NSData* result =
       ExtractVoiceSearchAudioDataFromPageHTML(kInvalidVoiceSearchHTML);
   EXPECT_TRUE(result == nil);
 }