Simplify the magic required to create IPC message headers a bit.

chrome/browser/automation/automation_provider.h

 // Copyright (c) 2010 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.
 
 // This implements a browser-side endpoint for UI automation activity.
 // The client-side endpoint is implemented by AutomationProxy.
 // The entire lifetime of this object should be contained within that of
 // the BrowserProcess, and in particular the NotificationService that's
 // hung off of it.
 
@@ skipping 220 matching lines @@
 
  private:
   void OnUnhandledMessage();
 
   // IPC Message callbacks.
   void WindowSimulateDrag(int handle,
                           std::vector<gfx::Point> drag_path,
                           int flags,
                           bool press_escape_en_route,
                           IPC::Message* reply_message);
-
-#if defined(OS_WIN)
-  // TODO(port): Replace HWND.
-  void GetTabHWND(int handle, HWND* tab_hwnd);
-#endif  // defined(OS_WIN)
   void HandleUnused(const IPC::Message& message, int handle);
   void SetFilteredInet(const IPC::Message& message, bool enabled);
   void GetFilteredInetHitCount(int* hit_count);
   void SetProxyConfig(const std::string& new_proxy_config);
 
   // Responds to the FindInPage request, retrieves the search query parameters,
   // launches an observer to listen for results and issues a StartFind request.
   void HandleFindRequest(int handle,
                          const AutomationMsg_Find_Params& params,
                          IPC::Message* reply_message);
@@ skipping 163 matching lines @@
   // True iff connected to an AutomationProxy.
   bool is_connected_;
 
   // True iff browser finished loading initial set of tabs.
   bool initial_loads_complete_;
 
   DISALLOW_COPY_AND_ASSIGN(AutomationProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOMATION_AUTOMATION_PROVIDER_H_