Make remaining parts of components/metrics use metrics namespace.

components/metrics/net/wifi_access_point_info_provider_chromeos.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_NET_WIFI_ACCESS_POINT_INFO_PROVIDER_CHROMEOS_H_
 #define COMPONENTS_METRICS_NET_WIFI_ACCESS_POINT_INFO_PROVIDER_CHROMEOS_H_
 
+#include <string>
+
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "chromeos/network/network_state_handler_observer.h"
 #include "components/metrics/net/wifi_access_point_info_provider.h"
 
+namespace metrics {
+
 // WifiAccessPointInfoProviderChromeos provides the connected wifi
 // acccess point information for chromeos.
 class WifiAccessPointInfoProviderChromeos
     : public WifiAccessPointInfoProvider,
       public chromeos::NetworkStateHandlerObserver,
       public base::SupportsWeakPtr<WifiAccessPointInfoProviderChromeos> {
  public:
   WifiAccessPointInfoProviderChromeos();
   virtual ~WifiAccessPointInfoProviderChromeos();
 
-  // WifiAccessPointInfoProvider
-  virtual bool GetInfo(WifiAccessPointInfo* info) override;
+  // WifiAccessPointInfoProvider:
+  bool GetInfo(WifiAccessPointInfo* info) override;
 
-  // NetworkStateHandlerObserver overrides.
-  virtual void DefaultNetworkChanged(
+  // NetworkStateHandlerObserver:
+  void DefaultNetworkChanged(
       const chromeos::NetworkState* default_network) override;
 
  private:
   // Callback from Shill.Service.GetProperties. Parses |properties| to obtain
   // the wifi access point information.
   void ParseInfo(const std::string& service_path,
                  const base::DictionaryValue& properties);
 
   WifiAccessPointInfo wifi_access_point_info_;
 
   DISALLOW_COPY_AND_ASSIGN(WifiAccessPointInfoProviderChromeos);
 };
 
+}  // namespace metrics
+
 #endif  // COMPONENTS_METRICS_NET_WIFI_ACCESS_POINT_INFO_PROVIDER_CHROMEOS_H_