Move more metrics classes to metrics namespace.

BUG=374763
[email protected]

Review URL: https://codereview.chromium.org/502173002

Cr-Commit-Position: refs/heads/master@{#291994}
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index b178721..c1546cb 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -479,7 +479,7 @@
   }
 
   // Tell the metrics service it was cleanly shutdown.
-  MetricsService* metrics = g_browser_process->metrics_service();
+  metrics::MetricsService* metrics = g_browser_process->metrics_service();
   if (metrics && local_state()) {
     metrics->RecordStartOfSessionEnd();
 #if !defined(OS_CHROMEOS)
@@ -535,7 +535,7 @@
   return metrics_services_manager_.get();
 }
 
-MetricsService* BrowserProcessImpl::metrics_service() {
+metrics::MetricsService* BrowserProcessImpl::metrics_service() {
   DCHECK(CalledOnValidThread());
   return GetMetricsServicesManager()->GetMetricsService();
 }