Revert of Reduce plugin_metrics_provider_ usage in MetricsService

chrome/browser/metrics/metrics_services_manager.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_METRICS_METRICS_SERVICES_MANAGER_H_
 #define CHROME_BROWSER_METRICS_METRICS_SERVICES_MANAGER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 
 class ChromeMetricsServiceClient;
 class MetricsService;
 class PrefService;
 
-namespace base {
-class FilePath;
-}
-
 namespace metrics {
 class MetricsStateManager;
 }
 
 namespace rappor {
 class RapporService;
 }
 
 namespace chrome_variations {
 class VariationsService;
@@ skipping 10 matching lines @@
 
   // Returns the MetricsService, creating it if it hasn't been created yet.
   MetricsService* GetMetricsService();
 
   // Returns the GetRapporService, creating it if it hasn't been created yet.
   rappor::RapporService* GetRapporService();
 
   // Returns the VariationsService, creating it if it hasn't been created yet.
   chrome_variations::VariationsService* GetVariationsService();
 
-  // Should be called when a plugin loading error occurs.
-  void OnPluginLoadingError(const base::FilePath& plugin_path);
-
  private:
   metrics::MetricsStateManager* GetMetricsStateManager();
 
   // Returns true iff metrics reporting is enabled.
   bool IsMetricsReportingEnabled() const;
 
   // Ensures that all functions are called from the same thread.
   base::ThreadChecker thread_checker_;
 
   // Weak pointer to the local state prefs store.
   PrefService* local_state_;
 
   // MetricsStateManager which is passed as a parameter to service constructors.
   scoped_ptr<metrics::MetricsStateManager> metrics_state_manager_;
 
   // Chrome embedder implementation of the MetricsServiceClient. Owns the
   // MetricsService.
   scoped_ptr<ChromeMetricsServiceClient> metrics_service_client_;
 
   // The RapporService, for RAPPOR metric uploads.
   scoped_ptr<rappor::RapporService> rappor_service_;
 
   // The VariationsService, for server-side experiments infrastructure.
   scoped_ptr<chrome_variations::VariationsService> variations_service_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsServicesManager);
 };
 
 #endif  // CHROME_BROWSER_METRICS_METRICS_SERVICES_MANAGER_H_