[UMA, Cleanup] Deprecate the UMA.GeneratedLowEntropySource histogram.

components/metrics/metrics_state_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 COMPONENTS_METRICS_METRICS_STATE_MANAGER_H_
 #define COMPONENTS_METRICS_METRICS_STATE_MANAGER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 99 matching lines @@
 
   // Loads the client info via |load_client_info_| and potentially migrates it
   // before returning it if it comes back in its old form.
   scoped_ptr<ClientInfo> LoadClientInfoAndMaybeMigrate();
 
   // Returns the low entropy source for this client. This is a random value
   // that is non-identifying amongst browser clients. This method will
   // generate the entropy source value if it has not been called before.
   int GetLowEntropySource();
 
+  // Generates the low entropy source value for this client if it is not
+  // already set.
+  void UpdateLowEntropySource();
+
   // Updates |entropy_source_returned_| with |type| iff the current value is
   // ENTROPY_SOURCE_NONE and logs the new value in a histogram.
   void UpdateEntropySourceReturnedValue(EntropySourceType type);
 
   // Returns the first entropy source that was returned by this service since
   // start up, or NONE if neither was returned yet. This is exposed for testing
   // only.
   EntropySourceType entropy_source_returned() const {
     return entropy_source_returned_;
   }
@@ skipping 31 matching lines @@
   EntropySourceType entropy_source_returned_;
 
   scoped_ptr<ClonedInstallDetector> cloned_install_detector_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsStateManager);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_METRICS_STATE_MANAGER_H_