win: Fix black pixel artifact at right and bottom

ui/views/win/hwnd_message_handler.h

Index: ui/views/win/hwnd_message_handler.h
diff --git a/ui/views/win/hwnd_message_handler.h b/ui/views/win/hwnd_message_handler.h
index 6c08f0a20d113ddf2f910a84fe2ff23b4c7a3373..c8a41cf769afd73f6a19730740a21cc43309ed00 100644
--- a/ui/views/win/hwnd_message_handler.h
+++ b/ui/views/win/hwnd_message_handler.h
@@ -401,6 +401,7 @@ class VIEWS_EXPORT HWNDMessageHandler :
     CR_MSG_WM_SETTEXT(OnSetText)
     CR_MSG_WM_SETTINGCHANGE(OnSettingChange)
     CR_MSG_WM_SIZE(OnSize)
+    CR_MSG_WM_SIZING(OnSizing)
     CR_MSG_WM_SYSCOMMAND(OnSysCommand)
     CR_MSG_WM_THEMECHANGED(OnThemeChanged)
     CR_MSG_WM_WINDOWPOSCHANGED(OnWindowPosChanged)
@@ -456,6 +457,7 @@ class VIEWS_EXPORT HWNDMessageHandler :
   LRESULT OnSetText(const wchar_t* text);
   void OnSettingChange(UINT flags, const wchar_t* section);
   void OnSize(UINT param, const gfx::Size& size);
+  void OnSizing(UINT edge, RECT* rect);
   void OnSysCommand(UINT notification_code, const gfx::Point& point);
   void OnThemeChanged();
   LRESULT OnTouchEvent(UINT message, WPARAM w_param, LPARAM l_param);