chrome: Cleanup class/struct forward declarations

chrome/browser/extensions/extension_service_test_base.h

 // Copyright 2014 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_EXTENSION_SERVICE_TEST_BASE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_TEST_BASE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 20 matching lines @@
 class Profile;
 class TestingProfile;
 
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 
 class ExtensionRegistry;
-class ManagementPolicy;
 
 // A unittest infrastructure which creates an ExtensionService. Whenever
 // possible, use this instead of creating a browsertest.
 // Note: Before adding methods to this class, please, please, please think about
 // whether they should go here or in a more specific subclass. Lots of things
 // need an ExtensionService, but they don't all need to know how you want yours
 // to be initialized.
 class ExtensionServiceTestBase : public testing::Test {
  public:
   struct ExtensionServiceInitParams {
@@ skipping 123 matching lines @@
   chromeos::ScopedTestCrosSettings test_cros_settings_;
   chromeos::ScopedTestUserManager test_user_manager_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionServiceTestBase);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_TEST_BASE_H_