[ObjC ARC] Converts ios/chrome/browser/ui/toolbar:toolbar to ARC.

ios/chrome/browser/ui/toolbar/toolbar_model_impl_ios.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.
 
 #include "ios/chrome/browser/ui/toolbar/toolbar_model_impl_ios.h"
 
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/toolbar/toolbar_model_impl.h"
 #include "ios/chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #import "ios/chrome/browser/tabs/legacy_tab_helper.h"
 #include "ios/chrome/browser/tabs/tab.h"
 #include "ios/chrome/browser/ui/toolbar/toolbar_model_delegate_ios.h"
 #import "ios/web/public/web_state/web_state.h"
+#import "ios/web/web_state/ui/crw_web_controller.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
 
 namespace {
 const size_t kMaxURLDisplayChars = 32 * 1024;
 
 bookmarks::BookmarkModel* GetBookmarkModelForWebState(
     web::WebState* web_state) {
   if (!web_state)
     return nullptr;
   web::BrowserState* browser_state = web_state->GetBrowserState();
   if (!browser_state)
@@ skipping 64 matching lines @@
 }
 
 bool ToolbarModelImplIOS::ShouldDisplayHintText() {
   web::WebState* web_state = delegate_->GetActiveWebState();
   if (!web_state)
     return false;
 
   Tab* tab = LegacyTabHelper::GetTabForWebState(web_state);
   return tab && [tab.webController wantsLocationBarHintText];
 }