FBTF: Clean up task.h in x11_util.h and header usage in some delegates.

chrome/browser/modal_html_dialog_delegate.h

 // Copyright (c) 2006-2008 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_BROWSER_MODAL_HTML_DIALOG_DELEGATE_H_
 #define CHROME_BROWSER_MODAL_HTML_DIALOG_DELEGATE_H_
 #pragma once
 
 #include <vector>
 
 #include "chrome/browser/dom_ui/html_dialog_ui.h"
 #include "chrome/common/notification_registrar.h"
-#include "gfx/size.h"
-#include "ipc/ipc_message.h"
+
+namespace gfx {
+class Size;
+}
+
+namespace IPC {
+class Message;
+}
 
 // This class can only be used on the UI thread.
 class ModalHtmlDialogDelegate
     : public HtmlDialogUIDelegate,
       public NotificationObserver {
  public:
   ModalHtmlDialogDelegate(const GURL& url,
                           int width, int height,
                           const std::string& json_arguments,
                           IPC::Message* sync_result,
@@ skipping 26 matching lines @@
   HtmlDialogUI::HtmlDialogParams params_;
 
   // Once we get our reply in OnModalDialogResponse we'll need to respond to the
   // plugin using this |sync_result| pointer so we store it between calls.
   IPC::Message* sync_response_;
 
   DISALLOW_COPY_AND_ASSIGN(ModalHtmlDialogDelegate);
 };
 
 #endif  // CHROME_BROWSER_MODAL_HTML_DIALOG_DELEGATE_H_