Move histogram_manager from components/metrics to components/cronet

components/cronet/histogram_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_HISTOGRAM_MANAGER_H_
-#define COMPONENTS_METRICS_HISTOGRAM_MANAGER_H_
+#ifndef COMPONENTS_CRONET_HISTOGRAM_MANAGER_H_
+#define COMPONENTS_CRONET_HISTOGRAM_MANAGER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram_flattener.h"
 #include "base/metrics/histogram_snapshot_manager.h"
 #include "components/metrics/proto/chrome_user_metrics_extension.pb.h"
 
-namespace metrics {
+namespace cronet {
 
-// TODO(mef): crbug.com/441441. Move components/metrics/histogram_manager.*
-// files into components/android/cronet.
-//
-// A HistogramManager instance is created by Android.  It is the central
-// controller for the acquisition of log data, and the automatic transmission of
-// that log data to an external server.
+// A HistogramManager instance is created by the app. It is the central
+// controller for the acquisition of log data, and recording deltas for
+// transmission to an external server.
 class HistogramManager : public base::HistogramFlattener {
  public:
   HistogramManager();
   ~HistogramManager() override;
 
   // Snapshot all histograms to record the delta into |uma_proto_| and then
   // returns the serialized protobuf representation of the record in |data|.
   // Returns true if it was successfully serialized.
   bool GetDeltas(std::vector<uint8>* data);
 
@@ skipping 13 matching lines @@
   void InconsistencyDetectedInLoggedCount(int amount) override;
 
   base::HistogramSnapshotManager histogram_snapshot_manager_;
 
   // Stores the protocol buffer representation for this log.
   metrics::ChromeUserMetricsExtension uma_proto_;
 
   DISALLOW_COPY_AND_ASSIGN(HistogramManager);
 };
 
-}  // namespace metrics
+}  // namespace cronet
 
-#endif  // COMPONENTS_METRICS_HISTOGRAM_MANAGER_H_
+#endif  // COMPONENTS_CRONET_HISTOGRAM_MANAGER_H_