Reduce plugin_metrics_provider_ usage in MetricsService

chrome/browser/plugins/plugin_observer.cc

Index: chrome/browser/plugins/plugin_observer.cc
diff --git a/chrome/browser/plugins/plugin_observer.cc b/chrome/browser/plugins/plugin_observer.cc
index 0848e1df9f4d67f2b277126a87bcc039d6426579..423e122a1763321acb6c9aa082877a7fb7ca7131 100644
--- a/chrome/browser/plugins/plugin_observer.cc
+++ b/chrome/browser/plugins/plugin_observer.cc
@@ -15,7 +15,7 @@
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/infobars/simple_alert_infobar_delegate.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
-#include "chrome/browser/metrics/metrics_service.h"
+#include "chrome/browser/metrics/plugin_metrics_provider.h"
 #include "chrome/browser/plugins/plugin_finder.h"
 #include "chrome/browser/plugins/plugin_infobar_delegates.h"
 #include "chrome/browser/profiles/profile.h"
@@ -456,7 +456,8 @@ void PluginObserver::OnOpenAboutPlugins() {
 }
 
 void PluginObserver::OnCouldNotLoadPlugin(const base::FilePath& plugin_path) {
-  g_browser_process->metrics_service()->LogPluginLoadingError(plugin_path);
+  g_browser_process->plugin_metrics_provider()->LogPluginLoadingError(
+      plugin_path);
   base::string16 plugin_name =
       PluginService::GetInstance()->GetPluginDisplayNameByPath(plugin_path);
   SimpleAlertInfoBarDelegate::Create(