Remove obviously unneeded forward declarations in chrome/browser/[abef]*/*.h.

chrome/browser/extensions/sandboxed_extension_unpacker.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_EXTENSIONS_SANDBOXED_EXTENSION_UNPACKER_H_
 #define CHROME_BROWSER_EXTENSIONS_SANDBOXED_EXTENSION_UNPACKER_H_
 #pragma once
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/ref_counted.h"
 #include "base/scoped_temp_dir.h"
 #include "base/values.h"
 #include "chrome/browser/utility_process_host.h"
 
 class Extension;
-class MessageLoop;
 class ResourceDispatcherHost;
 
 class SandboxedExtensionUnpackerClient
     : public base::RefCountedThreadSafe<SandboxedExtensionUnpackerClient> {
  public:
   // temp_dir - A temporary directory containing the results of the extension
   // unpacking. The client is responsible for deleting this directory.
   //
   // extension_root - The path to the extension root inside of temp_dir.
   //
@@ skipping 135 matching lines @@
   scoped_ptr<Extension> extension_;
 
   // Whether we've received a response from the utility process yet.
   bool got_response_;
 
   // The public key that was extracted from the CRX header.
   std::string public_key_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SANDBOXED_EXTENSION_UNPACKER_H_