Reduce the fullscreen window height by 1px on activation loss.

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 <stddef.h>
 
@@ skipping 237 matching lines @@
   // 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
   // did not do so.
   void SetInitialFocus();
 
   // Called after the WM_ACTIVATE message has been processed by the default
   // windows procedure.
-  void PostProcessActivateMessage(int activation_state, bool minimized);
+  void PostProcessActivateMessage(
+      int activation_state,
+      bool minimized,
+      HWND window_gaining_or_losing_activation);
 
   // Enables disabled owner windows that may have been disabled due to this
   // window's modality.
   void RestoreEnabledIfNecessary();
 
   // Executes the specified SC_command.
   void ExecuteSystemMenuCommand(int command);
 
   // Start tracking all mouse events so that this window gets sent mouse leave
   // messages too.
@@ skipping 371 matching lines @@
 
   // The factory used with BEGIN_SAFE_MSG_MAP_EX.
   base::WeakPtrFactory<HWNDMessageHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_