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

chrome/browser/first_run/first_run.cc

Index: chrome/browser/first_run/first_run.cc
diff --git a/chrome/browser/first_run/first_run.cc b/chrome/browser/first_run/first_run.cc
index b03e3222e2292e253172ad28a7de78826ef52127..fb9392926e4ed62117da3a1eee616d159f442630 100644
--- a/chrome/browser/first_run/first_run.cc
+++ b/chrome/browser/first_run/first_run.cc
@@ -31,7 +31,7 @@
 #include "chrome/installer/util/master_preferences.h"
 #include "chrome/installer/util/master_preferences_constants.h"
 #include "chrome/installer/util/util_constants.h"
-#include "content/browser/user_metrics.h"
+#include "content/public/browser/user_metrics.h"
 #include "googleurl/src/gurl.h"
 
 #if defined(OS_WIN)
@@ -40,6 +40,8 @@
 #include "chrome/installer/util/install_util.h"
 #endif
 
+using content::UserMetricsAction;
+
 namespace {
 
 // The kSentinelFile file absence will tell us it is a first run.
@@ -618,7 +620,7 @@ void FirstRun::AutoImport(
     ImportSettings(profile, importer_host, importer_list, items);
   }
 
-  UserMetrics::RecordAction(UserMetricsAction("FirstRunDef_Accept"));
+  content::RecordAction(UserMetricsAction("FirstRunDef_Accept"));
 
   // Launch the search engine dialog only for certain builds, and only if the
   // user has not already set preferences.