components: Cleanup class/struct fwd declarations

components/data_reduction_proxy/core/browser/data_reduction_proxy_settings_test_utils.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 COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_SETTINGS_TEST_UTILS_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_SETTINGS_TEST_UTILS_H_
 
 #include <map>
 #include <memory>
 #include <string>
 
 #include "base/message_loop/message_loop.h"
 #include "base/time/clock.h"
 #include "base/time/time.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
 #include "components/prefs/testing_pref_service.h"
 #include "net/log/test_net_log.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "net/url_request/url_request_test_util.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class PrefService;
-class TestingPrefServiceSimple;
 
 namespace data_reduction_proxy {
 
 class DataReductionProxyTestContext;
-class MockDataReductionProxyConfig;
 
 template <class C>
 class MockDataReductionProxySettings : public C {
  public:
   MockDataReductionProxySettings<C>() : C() {
   }
   MOCK_METHOD0(GetOriginalProfilePrefs, PrefService*());
   MOCK_METHOD0(GetLocalStatePrefs, PrefService*());
   MOCK_METHOD1(RecordStartupState,
                void(ProxyStartupState state));
@@ skipping 64 matching lines @@
                      bool promo_allowed,
                      bool holdback) override {
     return DataReductionProxySettingsTestBase::ResetSettings<C>(
         std::move(clock), allowed, fallback_allowed, promo_allowed, holdback);
   }
 };
 
 }  // namespace data_reduction_proxy
 
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_SETTINGS_TEST_UTILS_H_