Move EntropyProvider Source From MetricsService to MetricsServicesManager

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 106 matching lines @@
   // Returns the install date of the application, in seconds since the epoch.
   int64_t GetInstallDate();
 
   // Returns the date at which the current metrics client ID was created as
   // an int64_t containing seconds since the epoch.
   int64_t GetMetricsReportingEnabledDate();
 
   // Returns true if the last session exited cleanly.
   bool WasLastShutdownClean() const;
 
-  // Returns the preferred entropy provider used to seed persistent activities
-  // based on whether or not metrics reporting will be permitted on this client.
-  //
-  // If metrics reporting is enabled, this method returns an entropy provider
-  // that has a high source of entropy, partially based on the client ID.
-  // Otherwise, it returns an entropy provider that is based on a low entropy
-  // source.
-  std::unique_ptr<const base::FieldTrial::EntropyProvider>
-  CreateEntropyProvider();
-
   // At startup, prefs needs to be called with a list of all the pref names and
   // types we'll be using.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
   // HistogramFlattener:
   void RecordDelta(const base::HistogramBase& histogram,
                    const base::HistogramSamples& snapshot) override;
   void InconsistencyDetected(
       base::HistogramBase::Inconsistency problem) override;
   void UniqueInconsistencyDetected(
@@ skipping 360 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_