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

chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm
index 1a512414a9c70eb7fee4e4629decaf118b16c728..fbe66b38ab765901e0051188f4be5211db11e2bb 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm
@@ -9,11 +9,13 @@
 #include "base/logging.h"
 #import "base/memory/scoped_nsobject.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
-#import "chrome/browser/ui/cocoa/bookmarks/bookmark_button_cell.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_window.h"
+#import "chrome/browser/ui/cocoa/bookmarks/bookmark_button_cell.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/view_id_util.h"
-#include "content/browser/user_metrics.h"
+#include "content/public/browser/user_metrics.h"
+
+using content::UserMetricsAction;
 
 // The opacity of the bookmark button drag image.
 static const CGFloat kDragImageOpacity = 0.7;
@@ -196,9 +198,9 @@ BookmarkButton* gDraggedButton = nil; // Weak
   const BookmarkNode* node = [self bookmarkNode];
   const BookmarkNode* parent = node ? node->parent() : NULL;
   if (parent && parent->type() == BookmarkNode::FOLDER) {
-    UserMetrics::RecordAction(UserMetricsAction("BookmarkBarFolder_DragStart"));
+    content::RecordAction(UserMetricsAction("BookmarkBarFolder_DragStart"));
   } else {
-    UserMetrics::RecordAction(UserMetricsAction("BookmarkBar_DragStart"));
+    content::RecordAction(UserMetricsAction("BookmarkBar_DragStart"));
   }
 
   dragMouseOffset_ = [self convertPointFromBase:[event locationInWindow]];