[ObjC ARC] Converts components/translate/ios/browser:browser to ARC.

components/translate/ios/browser/translate_controller.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.
 
 #import "components/translate/ios/browser/translate_controller.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/values.h"
 #import "components/translate/ios/browser/js_translate_manager.h"
 #include "ios/web/public/web_state/web_state.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace translate {
 
 namespace {
 // Prefix for the translate javascript commands. Must be kept in sync with
 // translate_ios.js.
 const char kCommandPrefix[] = "translate";
 }
 
 TranslateController::TranslateController(web::WebState* web_state,
                                          JsTranslateManager* manager)
     : web::WebStateObserver(web_state),
       observer_(nullptr),
-      js_manager_([manager retain]),
+      js_manager_(manager),
       weak_method_factory_(this) {
   DCHECK(js_manager_);
   DCHECK(web::WebStateObserver::web_state());
   web_state->AddScriptCommandCallback(
       base::Bind(&TranslateController::OnJavascriptCommandReceived,
                  base::Unretained(this)),
       kCommandPrefix);
 }
 
 TranslateController::~TranslateController() {
@@ skipping 93 matching lines @@
   return true;
 }
 
 // web::WebStateObserver implementation.
 
 void TranslateController::WebStateDestroyed() {
   web_state()->RemoveScriptCommandCallback(kCommandPrefix);
 }
 
 }  // namespace translate