Remove the WM_SYSCOMMAND handling from the LegacyRenderWidgetHostHWND class.

ui/base/win/window_event_target.h

 // Copyright (c) 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.
 
 #ifndef UI_BASE_WIN_WINDOW_EVENT_TARGET_H_
 #define UI_BASE_WIN_WINDOW_EVENT_TARGET_H_
 
 #include <windows.h>
 
 #include "base/basictypes.h"
@@ skipping 56 matching lines @@
   // Handles the WM_NCHITTEST message
   // The |message| parameter identifies the message.
   // The |w_param| and |l_param| values are as per MSDN docs.
   // The |handled| parameter is an output parameter which when set to false
   // indicates that the message should be DefProc'ed.
   // Returns the result of processing the message.
   virtual LRESULT HandleNcHitTestMessage(unsigned int message,
                                          WPARAM w_param,
                                          LPARAM l_param,
                                          bool* handled) = 0;
-
-  // Handles the WM_SYSCOMMAND message
-  // The |message| parameter identifies the message.
-  // The |w_param| and |l_param| values are as per MSDN docs.
-  // The |handled| parameter is an output parameter which when set to false
-  // indicates that the message should be DefProc'ed.
-  // Returns the result of processing the message.
-  virtual LRESULT HandleSysCommand(unsigned int message,
-                                   WPARAM w_param,
-                                   LPARAM l_param,
-                                   bool* handled) = 0;
  protected:
   WindowEventTarget();
   virtual ~WindowEventTarget();
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_WIN_WINDOW_EVENT_TARGET_H_