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

chrome/test/automation/tab_proxy.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.
 
 #ifndef CHROME_TEST_AUTOMATION_TAB_PROXY_H_
 #define CHROME_TEST_AUTOMATION_TAB_PROXY_H_
 #pragma once
 
 #include "build/build_config.h"  // NOLINT
 
@@ skipping 179 matching lines @@
   // until the browser has initiated the close (wait_until_closed = false).
   //
   // When a tab is closed the browser does additional work via invoke later
   // and may wait for messages from the renderer. Supplying a value of true to
   // this method waits until all processing is done. Be careful with this,
   // when closing the last tab it is possible for the browser to shutdown BEFORE
   // the tab has completely closed. In other words, this may NOT be sent for
   // the last tab.
   bool Close(bool wait_until_closed) WARN_UNUSED_RESULT;
 
-#if defined(OS_WIN)
-  // TODO(port): Use portable replacement for HWND.
-
-  // Gets the HWND that corresponds to the content area of this tab.
-  // Returns true if the call was successful.
-  bool GetHWND(HWND* hwnd) const WARN_UNUSED_RESULT;
-#endif  // defined(OS_WIN)
-
   // Gets the process ID that corresponds to the content area of this tab.
   // Returns true if the call was successful.  If the specified tab has no
   // separate process for rendering its content, the return value is true but
   // the process_id is 0.
   bool GetProcessID(int* process_id) const WARN_UNUSED_RESULT;
 
   // Supply or cancel authentication to a login prompt.  These are synchronous
   // calls and hence block until the load finishes (or another login prompt
   // appears, in the case of invalid login info).
   bool SetAuth(const std::wstring& username,
@@ skipping 213 matching lines @@
   // purposes.
   void LastObjectRemoved();
 
  private:
   Lock list_lock_;  // Protects the observers_list_.
   ObserverList<TabProxyDelegate> observers_list_;
   DISALLOW_COPY_AND_ASSIGN(TabProxy);
 };
 
 #endif  // CHROME_TEST_AUTOMATION_TAB_PROXY_H_