Replace forward declaration with include in default_component_installer.h

chrome/browser/component_updater/default_component_installer.h

 // Copyright 2013 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_COMPONENT_UPDATER_DEFAULT_COMPONENT_INSTALLER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_DEFAULT_COMPONENT_INSTALLER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
+#include "base/values.h"
 #include "base/version.h"
 #include "chrome/browser/component_updater/component_updater_service.h"
 
 namespace base {
-class DictionaryValue;
 class FilePath;
 class SequencedTaskRunner;
 class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace component_updater {
 
 // Components should use a DefaultComponentInstaller by defining a class that
 // implements the members of ComponentInstallerTraits, and then registering a
 // DefaultComponentInstaller that has been constructed with an instance of that
@@ skipping 84 matching lines @@
   scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultComponentInstaller);
 };
 
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_DEFAULT_COMPONENT_INSTALLER_H_