Delete obviously unneeded forward declarations in chrome/browser/*.h.

chrome/browser/app_modal_dialog.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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_BROWSER_APP_MODAL_DIALOG_H_
 #define CHROME_BROWSER_APP_MODAL_DIALOG_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 
 // Define NativeDialog type as platform specific dialog view.
 #if defined(OS_WIN)
 class ModalDialogDelegate;
 typedef ModalDialogDelegate* NativeDialog;
 #elif defined(OS_MACOSX)
 typedef void* NativeDialog;
 #elif defined(TOOLKIT_USES_GTK)
 typedef struct _GtkDialog GtkDialog;
 typedef struct _GtkWidget GtkWidget;
 typedef int gint;
 typedef GtkWidget* NativeDialog;
 #endif
 
 class TabContents;
-namespace IPC {
-class Message;
-}
 
 // A controller+model base class for modal dialogs.
 class AppModalDialog {
  public:
   // A union of data necessary to determine the type of message box to
   // show. |tab_contents| parameter is optional, if provided that tab will be
   // activated before the modal dialog is displayed.
   AppModalDialog(TabContents* tab_contents, const std::wstring& title);
   virtual ~AppModalDialog();
 
@@ skipping 62 matching lines @@
 
   // True if the dialog should no longer be shown, e.g. because the underlying
   // tab navigated away while the dialog was queued.
   bool skip_this_dialog_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AppModalDialog);
 };
 
 #endif  // CHROME_BROWSER_APP_MODAL_DIALOG_H_