Move GuestView layer in browser to components

chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.mm

 // Copyright (c) 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 "chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/logging.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet.h"
 #import "chrome/browser/ui/cocoa/single_web_contents_dialog_manager_cocoa.h"
+#include "components/guest_view/browser/guest_view_base.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "content/public/browser/browser_thread.h"
-#include "extensions/browser/guest_view/guest_view_base.h"
 
 using web_modal::WebContentsModalDialogManager;
 
 ConstrainedWindowMac::ConstrainedWindowMac(
     ConstrainedWindowMacDelegate* delegate,
     content::WebContents* web_contents,
     id<ConstrainedWindowSheet> sheet)
     : delegate_(delegate) {
   DCHECK(sheet);
 
   // |web_contents| may be embedded within a chain of nested GuestViews. If it
   // is, follow the chain of embedders to the outermost WebContents and use it.
-  while (extensions::GuestViewBase* guest_view =
-             extensions::GuestViewBase::FromWebContents(web_contents)) {
-    if (!guest_view->embedder_web_contents())
-      break;
-    web_contents = guest_view->embedder_web_contents();
-  }
+  web_contents = guestview::GuestViewBase::GetTopLevelWebContents(web_contents);
 
   auto manager = WebContentsModalDialogManager::FromWebContents(web_contents);
   scoped_ptr<SingleWebContentsDialogManagerCocoa> native_manager(
       new SingleWebContentsDialogManagerCocoa(this, sheet, manager));
   manager->ShowDialogWithManager([sheet sheetWindow], native_manager.Pass());
 }
 
 ConstrainedWindowMac::~ConstrainedWindowMac() {
   CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   DCHECK(!manager_);
 }
 
 void ConstrainedWindowMac::CloseWebContentsModalDialog() {
   if (manager_)
     manager_->Close();
 }
 
 void ConstrainedWindowMac::OnDialogClosing() {
   if (delegate_)
     delegate_->OnConstrainedWindowClosed(this);
 }