Move more metrics classes to metrics namespace.

components/metrics/metrics_log.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_log.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 25 matching lines @@
 #endif
 
 #if defined(OS_WIN)
 #include "base/win/metro.h"
 
 // http://blogs.msdn.com/oldnewthing/archive/2004/10/25/247180.aspx
 extern "C" IMAGE_DOS_HEADER __ImageBase;
 #endif
 
 using base::SampleCountIterator;
-using metrics::HistogramEventProto;
-using metrics::ProfilerEventProto;
-using metrics::SystemProfileProto;
-using metrics::UserActionEventProto;
 typedef variations::ActiveGroupId ActiveGroupId;
 
+namespace metrics {
+
 namespace {
 
 // Any id less than 16 bytes is considered to be a testing id.
 bool IsTestingID(const std::string& id) {
   return id.size() < 16;
 }
 
 // Returns the date at which the current metrics client ID was created as
 // a string containing seconds since the epoch, or "0" if none was found.
 std::string GetMetricsEnabledDate(PrefService* pref) {
@@ skipping 366 matching lines @@
 
 void MetricsLog::CloseLog() {
   DCHECK(!closed_);
   closed_ = true;
 }
 
 void MetricsLog::GetEncodedLog(std::string* encoded_log) {
   DCHECK(closed_);
   uma_proto_.SerializeToString(encoded_log);
 }
+
+}  // namespace metrics