Made desktop capture screen tab-constrained in ASH

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 190 matching lines @@
 #if defined(TOOLKIT_VIEWS) || defined(OS_MACOSX)
     picker_ = DesktopMediaPicker::Create();
 #else
     error_ = "Desktop Capture API is not yet implemented for this platform.";
     return false;
 #endif
   }
   DesktopMediaPicker::DoneCallback callback = base::Bind(
       &DesktopCaptureChooseDesktopMediaFunction::OnPickerDialogResults, this);
 
-  picker_->Show(parent_window, parent_window,
+  picker_->Show(web_contents(),
+                parent_window, parent_window,
                 base::UTF8ToUTF16(GetExtension()->name()),
                 target_name,
                 media_list.Pass(), callback);
   return true;
 }
 
 void DesktopCaptureChooseDesktopMediaFunction::WebContentsDestroyed() {
   Cancel();
 }
 
@@ skipping 69 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