Allow cert-popup for WebView guests.

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/logging.h"
 #include "base/memory/scoped_ptr.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet.h"
 #import "chrome/browser/ui/cocoa/single_web_contents_dialog_manager_cocoa.h"
@@ skipping 14 matching lines @@
   // is, follow the chain of embedders to the outermost WebContents and use it.
   web_contents =
       guest_view::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());
 }
 
+bool ConstrainedWindowMac::HasTopLevelDialogManager(
+    content::WebContents* web_contents) {
+  // |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.
+  web_contents =
+      guest_view::GuestViewBase::GetTopLevelWebContents(web_contents);
+
+  return WebContentsModalDialogManager::FromWebContents(web_contents) != NULL;
+}
+
 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);
 }