Fix display:none issue for <webview>.

chrome/browser/guest_view/web_view/web_view_guest.cc

 // 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 "chrome/browser/guest_view/web_view/web_view_guest.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/api/web_request/web_request_api.h"
@@ skipping 361 matching lines @@
 }
 
 bool WebViewGuest::IsDragAndDropEnabled() const {
   return true;
 }
 
 void WebViewGuest::WillDestroy() {
   if (!attached() && GetOpener())
     GetOpener()->pending_new_windows_.erase(this);
   DestroyUnattachedWindows();
+
+  scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
+  DispatchEventToEmbedder(
+      new GuestViewBase::Event(webview::kEventPluginDestroyed, args.Pass()));
 }
 
 bool WebViewGuest::AddMessageToConsole(WebContents* source,
                                        int32 level,
                                        const base::string16& message,
                                        int32 line_no,
                                        const base::string16& source_id) {
   scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
   // Log levels are from base/logging.h: LogSeverity.
   args->SetInteger(webview::kLevel, level);
@@ skipping 730 matching lines @@
   WebViewGuest* guest =
       WebViewGuest::From(embedder_render_process_id(), new_window_instance_id);
   if (!guest)
     return;
 
   if (!allow)
     guest->Destroy();
 }
 
 }  // namespace extensions