Remove legacy draggable region code and refactor to share common draggable region code

chrome/browser/ui/extensions/native_shell_window.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_EXTENSIONS_NATIVE_SHELL_WINDOW_H_
 #define CHROME_BROWSER_UI_EXTENSIONS_NATIVE_SHELL_WINDOW_H_
 
 #include "chrome/browser/ui/extensions/shell_window.h"
 #include "chrome/browser/ui/base_window.h"
 
 // This is an interface to a native implementation of a shell window, used for
 // new-style packaged apps. Shell windows contain a web contents, but no tabs
 // or URL bar.
 class NativeShellWindow : public BaseWindow {
  public:
   // Used by ShellWindow to instantiate the platform-specific ShellWindow code.
   static NativeShellWindow* Create(ShellWindow* window,
                                    const ShellWindow::CreateParams& params);
 
   // Called when the draggable regions are changed.
   virtual void UpdateDraggableRegions(
-      const std::vector<extensions::DraggableRegion>& regions) {}
-
-  // Called when the draggable regions with the old syntax are changed.
-  // TODO(jianli): to be removed after WebKit patch that changes the draggable
-  // region syntax is landed.
-  virtual void UpdateLegacyDraggableRegions(
-      const std::vector<extensions::DraggableRegion>& regions) {}
+      const std::vector<extensions::DraggableRegion>& regions) = 0;
 
   virtual void SetFullscreen(bool fullscreen) = 0;
   virtual bool IsFullscreenOrPending() const = 0;
 
   // Called when the icon of the window changes.
   virtual void UpdateWindowIcon() = 0;
 
   // Called when the title of the window changes.
   virtual void UpdateWindowTitle() = 0;
 
   // Allows the window to handle unhandled keyboard messages coming back from
   // the renderer.
   virtual void HandleKeyboardEvent(
       const content::NativeWebKeyboardEvent& event) = 0;
 
   virtual ~NativeShellWindow() {}
 };
 
 #endif  // CHROME_BROWSER_UI_EXTENSIONS_NATIVE_SHELL_WINDOW_H_