[Metrics] Move ExternalMetrics ownership to ChromeBrowserMainPartsChromeos

chrome/browser/chromeos/chrome_browser_main_chromeos.h

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.h
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.h b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
index 9f1b5e4fd05752fc23999b528702ab8cb76e6913..cd3b3673ade96fc5b21b81269524fdedb5f8796b 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.h
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
@@ -8,6 +8,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "chrome/browser/chrome_browser_main_linux.h"
+#include "chrome/browser/chromeos/external_metrics.h"
 #include "chrome/browser/chromeos/version_loader.h"
 
 namespace content {
@@ -71,6 +72,8 @@ class ChromeBrowserMainPartsChromeos : public ChromeBrowserMainPartsLinux {
 
   scoped_ptr<EventRewriterController> keyboard_event_rewriters_;
 
+  scoped_refptr<chromeos::ExternalMetrics> external_metrics_;
+
   VersionLoader cros_version_loader_;
   base::CancelableTaskTracker tracker_;
   bool use_new_network_change_notifier_;