We have a problem in the process on destroying WebContentsImpl because

chrome/browser/extensions/api/desktop_capture/desktop_capture_api.cc

 // Copyright 2013 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/extensions/api/desktop_capture/desktop_capture_api.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
@@ skipping 197 matching lines @@
   DesktopMediaPicker::DoneCallback callback = base::Bind(
       &DesktopCaptureChooseDesktopMediaFunction::OnPickerDialogResults, this);
 
   picker_->Show(parent_window, parent_window,
                 base::UTF8ToUTF16(GetExtension()->name()),
                 target_name,
                 media_list.Pass(), callback);
   return true;
 }
 
-void DesktopCaptureChooseDesktopMediaFunction::WebContentsDestroyed(
-    content::WebContents* web_contents) {
+void DesktopCaptureChooseDesktopMediaFunction::WebContentsDestroyed() {
   Cancel();
 }
 
 void DesktopCaptureChooseDesktopMediaFunction::OnPickerDialogResults(
     content::DesktopMediaID source) {
   std::string result;
   if (source.type != content::DesktopMediaID::TYPE_NONE) {
     DesktopStreamsRegistry* registry =
         MediaCaptureDevicesDispatcher::GetInstance()->
         GetDesktopStreamsRegistry();
@@ skipping 62 matching lines @@
 
 void DesktopCaptureRequestsRegistry::CancelRequest(int process_id,
                                                    int request_id) {
   RequestsMap::iterator it = requests_.find(RequestId(process_id, request_id));
   if (it != requests_.end())
     it->second->Cancel();
 }
 
 
 }  // namespace extensions