Extract the handling of the clean exit beacon from MetricsService. The extracted implementation sup…

chrome/browser/metrics/chrome_metrics_service_client.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_CHROME_METRICS_SERVICE_CLIENT_H_
 #define CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICE_CLIENT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 53 matching lines @@
   virtual std::string GetVersionString() OVERRIDE;
   virtual void OnLogUploadComplete() OVERRIDE;
   virtual void StartGatheringMetrics(
       const base::Closure& done_callback) OVERRIDE;
   virtual void CollectFinalMetrics(const base::Closure& done_callback)
       OVERRIDE;
   virtual scoped_ptr<metrics::MetricsLogUploader> CreateUploader(
       const std::string& server_url,
       const std::string& mime_type,
       const base::Callback<void(int)>& on_upload_complete) OVERRIDE;
+  virtual base::string16 GetRegistryBackupKey() OVERRIDE;
 
   metrics::MetricsService* metrics_service() { return metrics_service_.get(); }
 
   void LogPluginLoadingError(const base::FilePath& plugin_path);
 
  private:
   explicit ChromeMetricsServiceClient(
       metrics::MetricsStateManager* state_manager);
 
   // Completes the two-phase initialization of ChromeMetricsServiceClient.
@@ skipping 94 matching lines @@
   // The MemoryGrowthTracker instance that tracks memory usage growth in
   // MemoryDetails.
   MemoryGrowthTracker memory_growth_tracker_;
 
   base::WeakPtrFactory<ChromeMetricsServiceClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeMetricsServiceClient);
 };
 
 #endif  // CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICE_CLIENT_H_