Make remaining parts of components/metrics use metrics namespace.

components/metrics/net/wifi_access_point_info_provider.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_H_
 #define COMPONENTS_METRICS_NET_WIFI_ACCESS_POINT_INFO_PROVIDER_H_
 
 #include <string>
 #include "base/basictypes.h"
 
+namespace metrics {
+
 // Interface for accessing connected wireless access point information.
 class WifiAccessPointInfoProvider {
  public:
   // Wifi access point security mode definitions.
   enum WifiSecurityMode {
     WIFI_SECURITY_UNKNOWN = 0,
     WIFI_SECURITY_WPA = 1,
     WIFI_SECURITY_WEP = 2,
     WIFI_SECURITY_RSN = 3,
     WIFI_SECURITY_802_1X = 4,
@@ skipping 18 matching lines @@
 
   // Fill in the wifi access point info if device is currently connected to a
   // wifi access point. Return true if device is connected to a wifi access
   // point, false otherwise.
   virtual bool GetInfo(WifiAccessPointInfo *info);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WifiAccessPointInfoProvider);
 };
 
+}  // namespace metrics
+
 #endif  // COMPONENTS_METRICS_NET_WIFI_ACCESS_POINT_INFO_PROVIDER_H_