[ObjC ARC] Converts ios/chrome/browser/web:web_internal to ARC.

ios/chrome/browser/web/chrome_web_client.mm

 // 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 "ios/chrome/browser/web/chrome_web_client.h"
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/ios/ios_util.h"
 #include "base/mac/bundle_locations.h"
@@ skipping 16 matching lines @@
 #include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #include "ios/public/provider/chrome/browser/voice/audio_session_controller.h"
 #include "ios/public/provider/chrome/browser/voice/voice_search_provider.h"
 #include "ios/web/public/browser_url_rewriter.h"
 #include "ios/web/public/user_agent.h"
 #include "net/http/http_util.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 // Returns an autoreleased string containing the JavaScript loaded from a
 // bundled resource file with the given name (excluding extension).
 NSString* GetPageScript(NSString* script_file_name) {
   DCHECK(script_file_name);
   NSString* path =
       [base::mac::FrameworkBundle() pathForResource:script_file_name
                                              ofType:@"js"];
   DCHECK(path) << "Script file not found: "
                << base::SysNSStringToUTF8(script_file_name) << ".js";
@@ skipping 125 matching lines @@
 }
 
 std::unique_ptr<base::TaskScheduler::InitParams>
 ChromeWebClient::GetTaskSchedulerInitParams() {
   return task_scheduler_util::GetBrowserTaskSchedulerInitParamsFromVariations();
 }
 
 void ChromeWebClient::PerformExperimentalTaskSchedulerRedirections() {
   task_scheduler_util::MaybePerformBrowserTaskSchedulerRedirection();
 }