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 87%
rename from components/metrics/histogram_manager.h
rename to components/cronet/histogram_manager.h
index 7334ae35f29a0305efdb6fc5d85b3288fdbd73fa..c0b53fad04ba0047b10a51d5de81337bc2514b86 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>
@@ -18,9 +18,6 @@
 
 namespace metrics {
 
-// 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.
@@ -59,4 +56,4 @@ class HistogramManager : public base::HistogramFlattener {
 
 }  // namespace metrics
 
-#endif  // COMPONENTS_METRICS_HISTOGRAM_MANAGER_H_
+#endif  // COMPONENTS_CRONET_HISTOGRAM_MANAGER_H_