Move more metrics classes to metrics namespace.

components/metrics/metrics_reporting_scheduler.cc

 // 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.
 
 #include "components/metrics/metrics_reporting_scheduler.h"
 
 #include "base/compiler_specific.h"
 #include "base/metrics/histogram.h"
 
 using base::TimeDelta;
 
+namespace metrics {
+
 namespace {
 
 // The delay, in seconds, after startup before sending the first log message.
 #if defined(OS_ANDROID) || defined(OS_IOS)
 // Sessions are more likely to be short on a mobile device, so handle the
 // initial log quickly.
 const int kInitialUploadIntervalSeconds = 15;
 #else
 const int kInitialUploadIntervalSeconds = 60;
 #endif
@@ skipping 129 matching lines @@
   upload_interval_ = TimeDelta::FromMicroseconds(
       static_cast<int64>(kBackoffMultiplier *
                          upload_interval_.InMicroseconds()));
 
   TimeDelta max_interval = kMaxBackoffMultiplier *
       TimeDelta::FromSeconds(kStandardUploadIntervalSeconds);
   if (upload_interval_ > max_interval || upload_interval_.InSeconds() < 0) {
     upload_interval_ = max_interval;
   }
 }
+
+}  // namespace metrics