components: Cleanup class/struct fwd declarations

components/metrics/metrics_service.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.
 
 // This file defines a service that collects information about the user
 // experience in order to help improve future versions of the app.
 
 #ifndef COMPONENTS_METRICS_METRICS_SERVICE_H_
 #define COMPONENTS_METRICS_METRICS_SERVICE_H_
 
@@ skipping 20 matching lines @@
 #include "components/metrics/metrics_log.h"
 #include "components/metrics/metrics_log_manager.h"
 #include "components/metrics/metrics_provider.h"
 #include "components/metrics/net/network_metrics_provider.h"
 #include "components/variations/synthetic_trials.h"
 
 class PrefService;
 class PrefRegistrySimple;
 
 namespace base {
-class DictionaryValue;
 class HistogramSamples;
 class PrefService;
 }
 
 namespace variations {
 struct ActiveGroupId;
 }
 
-namespace net {
-class URLFetcher;
-}
-
 namespace metrics {
 
 class MetricsLogUploader;
 class MetricsReportingScheduler;
 class MetricsServiceAccessor;
 class MetricsServiceClient;
 class MetricsStateManager;
 
 // See metrics_service.cc for a detailed description.
 class MetricsService : public base::HistogramFlattener {
@@ skipping 431 matching lines @@
   // Weak pointers factory used for saving state. All weak pointers managed by
   // this factory are invalidated in ScheduleNextStateSave.
   base::WeakPtrFactory<MetricsService> state_saver_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsService);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_METRICS_SERVICE_H_