Implement drag and drop testing in a platform independent way.

chrome/browser/ui/panels/panel_browser_window_cocoa.mm

 // Copyright (c) 2011 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/panels/panel_browser_window_cocoa.h"
 
 #include "base/logging.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/cocoa/find_bar/find_bar_bridge.h"
 #include "chrome/browser/ui/panels/panel.h"
@@ skipping 149 matching lines @@
 
 Browser* PanelBrowserWindowCocoa::GetPanelBrowser() const {
   return browser();
 }
 
 void PanelBrowserWindowCocoa::DestroyPanelBrowser() {
   [controller_ close];
   controller_ = NULL;
 }
 
-NativePanelTesting* PanelBrowserWindowCocoa::GetNativePanelTesting() {
-  return this;
+// NativePanelTesting implementation.
+NativePanelTesting* NativePanelTesting::Create(NativePanel* native_panel) {
+  NOTIMPLEMENTED();
+  return NULL;
 }