Move histogram_manager from components/metrics to components/cronet

components/cronet/histogram_manager.h

Index: components/cronet/histogram_manager.h
diff --git a/components/metrics/histogram_manager.h b/components/cronet/histogram_manager.h
similarity index 77%
rename from components/metrics/histogram_manager.h
rename to components/cronet/histogram_manager.h
index 7334ae35f29a0305efdb6fc5d85b3288fdbd73fa..ae4b249cc43ad69cfee23406f2c04a7f270c2dd7 100644
--- a/components/metrics/histogram_manager.h
+++ b/components/cronet/histogram_manager.h
@@ -2,8 +2,8 @@
 // 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>
@@ -16,14 +16,11 @@
 #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();
@@ -57,6 +54,6 @@ class HistogramManager : public base::HistogramFlattener {
   DISALLOW_COPY_AND_ASSIGN(HistogramManager);
 };
 
-}  // namespace metrics
+}  // namespace cronet
 
-#endif  // COMPONENTS_METRICS_HISTOGRAM_MANAGER_H_
+#endif  // COMPONENTS_CRONET_HISTOGRAM_MANAGER_H_