Headers cleanup in chrome/common

chrome/common/extensions/extension_error_reporter.h

 // Copyright (c) 2006-2009 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_COMMON_EXTENSIONS_ERROR_REPORTER_H_
 #define CHROME_COMMON_EXTENSIONS_ERROR_REPORTER_H_
 
 #include <string>
 #include <vector>
 
-#include "base/message_loop.h"
+class MessageLoop;
 
 // Exposes an easy way for the various components of the extension system to
 // report errors. This is a singleton that lives on the UI thread, with the
 // exception of ReportError() which may be called from any thread.
 // TODO(aa): Hook this up to about:extensions, when we have about:extensions.
 // TODO(aa): Consider exposing directly, or via a helper, to the renderer
 // process and plumbing the errors out to the browser.
 // TODO(aa): Add ReportError(extension_id, message, be_noisy), so that we can
 // report errors that are specific to a particular extension.
 class ExtensionErrorReporter {
@@ skipping 19 matching lines @@
   static ExtensionErrorReporter* instance_;
 
   ExtensionErrorReporter(bool enable_noisy_errors);
 
   MessageLoop* ui_loop_;
   std::vector<std::string> errors_;
   bool enable_noisy_errors_;
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_ERROR_REPORTER_H_