Move more metrics classes to metrics namespace.

chrome/browser/metrics/extensions_metrics_provider_unittest.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 "chrome/browser/metrics/extensions_metrics_provider.h"
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/testing_pref_service.h"
@@ skipping 85 matching lines @@
   EXPECT_EQ(10,
             TestExtensionsMetricsProvider::HashExtension(
                 "mdhofdjgenpkhlmddfaegdjddcecipmo", 3817));
 }
 
 // Checks that the fake set of extensions provided by
 // TestExtensionsMetricsProvider is encoded properly.
 TEST(ExtensionsMetricsProvider, SystemProtoEncoding) {
   metrics::SystemProfileProto system_profile;
   TestingPrefServiceSimple local_state;
-  MetricsService::RegisterPrefs(local_state.registry());
+  metrics::MetricsService::RegisterPrefs(local_state.registry());
   scoped_ptr<metrics::MetricsStateManager> metrics_state_manager(
       metrics::MetricsStateManager::Create(
           &local_state,
           base::Bind(&IsMetricsReportingEnabled),
           base::Bind(&StoreNoClientInfoBackup),
           base::Bind(&ReturnNoBackup)));
   TestExtensionsMetricsProvider extension_metrics(metrics_state_manager.get());
   extension_metrics.ProvideSystemProfileMetrics(&system_profile);
   ASSERT_EQ(2, system_profile.occupied_extension_bucket_size());
   EXPECT_EQ(10, system_profile.occupied_extension_bucket(0));
   EXPECT_EQ(1007, system_profile.occupied_extension_bucket(1));
 }