Split UserMetrics into API vs. implementation. Move API to content/public.

chrome/browser/chromeos/login/screen_locker_views.cc

Index: chrome/browser/chromeos/login/screen_locker_views.cc
diff --git a/chrome/browser/chromeos/login/screen_locker_views.cc b/chrome/browser/chromeos/login/screen_locker_views.cc
index 7a82e25b683882c200ef2abb2ca8a98946c433ca..787242787515430009c5e8c0b711b27b1ce97eaa 100644
--- a/chrome/browser/chromeos/login/screen_locker_views.cc
+++ b/chrome/browser/chromeos/login/screen_locker_views.cc
@@ -27,7 +27,7 @@
 #include "chrome/browser/ui/views/window.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
-#include "content/browser/user_metrics.h"
+#include "content/public/browser/user_metrics.h"
 #include "grit/theme_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/x/x11_util.h"
@@ -39,6 +39,8 @@
 #include "ui/views/widget/native_widget_gtk.h"
 #endif
 
+using content::UserMetricsAction;
+
 namespace {
 
 // The active ScreenLockerDelegate.
@@ -701,7 +703,7 @@ void ScreenLockerViews::OnGrabInputs() {
 void ScreenLockerViews::StartScreenSaver() {
   if (!background_view_->IsScreenSaverVisible()) {
     VLOG(1) << "StartScreenSaver";
-    UserMetrics::RecordAction(
+    content::RecordAction(
         UserMetricsAction("ScreenLocker_StartScreenSaver"));
     background_view_->ShowScreenSaver();
     if (screen_lock_view_) {