Remove the WM_SYSCOMMAND handling from the LegacyRenderWidgetHostHWND class.

ui/views/win/hwnd_message_handler.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 UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 
 #include <windows.h>
 
 #include <set>
@@ skipping 221 matching lines @@
   virtual LRESULT HandleScrollMessage(unsigned int message,
                                       WPARAM w_param,
                                       LPARAM l_param,
                                       bool* handled) OVERRIDE;
 
   virtual LRESULT HandleNcHitTestMessage(unsigned int message,
                                          WPARAM w_param,
                                          LPARAM l_param,
                                          bool* handled) OVERRIDE;
 
-  virtual LRESULT HandleSysCommand(unsigned int message,
-                                   WPARAM w_param,
-                                   LPARAM l_param,
-                                   bool* handled);
-
   // Returns the auto-hide edges of the appbar. See
   // ViewsDelegate::GetAppbarAutohideEdges() for details. If the edges change,
   // OnAppbarAutohideEdgesChanged() is called.
   int GetAppbarAutohideEdges(HMONITOR monitor);
 
   // Callback if the autohide edges have changed. See
   // ViewsDelegate::GetAppbarAutohideEdges() for details.
   void OnAppbarAutohideEdgesChanged();
 
   // Can be called after the delegate has had the opportunity to set focus and
@@ skipping 359 matching lines @@
   // Time the last WM_MOUSEHWHEEL message is received. Please refer to the
   // HandleMouseEventInternal function as to why this is needed.
   long last_mouse_hwheel_time_;
 
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_