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

chrome/browser/automation/automation_provider_win.cc

 // 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.
 
 #include "chrome/browser/automation/automation_provider.h"
 
 #include "app/keyboard_codes.h"
 #include "base/debug/trace_event.h"
 #include "base/json/json_reader.h"
 #include "base/utf_string_conversions.h"
@@ skipping 211 matching lines @@
                 MAKELPARAM(end.x, end.y));
 
     MessageLoop::current()->PostTask(FROM_HERE, new InvokeTaskLaterTask(
         new WindowDragResponseTask(this, reply_message)));
   } else {
     AutomationMsg_WindowDrag::WriteReplyParams(reply_message, false);
     Send(reply_message);
   }
 }
 
-void AutomationProvider::GetTabHWND(int handle, HWND* tab_hwnd) {
-  *tab_hwnd = NULL;
-
-  if (tab_tracker_->ContainsHandle(handle)) {
-    NavigationController* tab = tab_tracker_->GetResource(handle);
-    *tab_hwnd = tab->tab_contents()->GetNativeView();
-  }
-}
-
 void AutomationProvider::CreateExternalTab(
     const IPC::ExternalTabSettings& settings,
     gfx::NativeWindow* tab_container_window, gfx::NativeWindow* tab_window,
     int* tab_handle, int* session_id) {
   TRACE_EVENT_BEGIN("AutomationProvider::CreateExternalTab", 0, "");
 
   *tab_handle = 0;
   *tab_container_window = NULL;
   *tab_window = NULL;
   *session_id = -1;
@@ skipping 291 matching lines @@
 
 void AutomationProvider::OnSetZoomLevel(int handle, int zoom_level) {
   if (tab_tracker_->ContainsHandle(handle)) {
     NavigationController* tab = tab_tracker_->GetResource(handle);
     if (tab->tab_contents() && tab->tab_contents()->render_view_host()) {
       tab->tab_contents()->render_view_host()->Zoom(
           static_cast<PageZoom::Function>(zoom_level));
     }
   }
 }