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

chrome/browser/app_controller_mac.h

Index: chrome/browser/app_controller_mac.h
diff --git a/chrome/browser/app_controller_mac.h b/chrome/browser/app_controller_mac.h
index ea08903528bea8b38c8e288e1927511cbb45b06b..dc555e0f1c28f8a6dff935d258eca6cc1308509a 100644
--- a/chrome/browser/app_controller_mac.h
+++ b/chrome/browser/app_controller_mac.h
@@ -1,4 +1,4 @@
-// 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.
 
@@ -15,7 +15,6 @@
 @class AboutWindowController;
 class BookmarkMenuBridge;
 class CommandUpdater;
-@class CrApplication;
 class GURL;
 class HistoryMenuBridge;
 @class PreferencesWindowController;