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

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

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_view.h"
 
 #include "chrome/browser/bookmarks/bookmark_pasteboard_helper_mac.h"
 #include "chrome/browser/profiles/profile.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_folder_target.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
-#include "content/browser/user_metrics.h"
+#include "content/public/browser/user_metrics.h"
+
+using content::UserMetricsAction;
 
 #import "third_party/mozilla/NSPasteboard+Utils.h"
 
 @interface BookmarkBarFolderView()
 
 @property(readonly, nonatomic) id<BookmarkButtonControllerProtocol> controller;
 
 @end
 
 @implementation BookmarkBarFolderView
@@ skipping 173 matching lines @@
     const BookmarkNode* const source_node = [button bookmarkNode];
     const BookmarkNode* const target_node =
         model->GetNodeByID(source_node->id());
 
     BOOL copy =
         !([info draggingSourceOperationMask] & NSDragOperationMove) ||
         (source_node != target_node);
     doDrag = [[self controller] dragButton:button
                                         to:[info draggingLocation]
                                       copy:copy];
-    UserMetrics::RecordAction(UserMetricsAction("BookmarkBarFolder_DragEnd"));
+    content::RecordAction(UserMetricsAction("BookmarkBarFolder_DragEnd"));
   }
   return doDrag;
 }
 
 - (BOOL)performDragOperation:(id<NSDraggingInfo>)info {
   if ([[self controller] dragBookmarkData:info])
     return YES;
   NSPasteboard* pboard = [info draggingPasteboard];
   if ([pboard dataForType:kBookmarkButtonDragType] &&
       [self performDragOperationForBookmarkButton:info])
     return YES;
   if ([pboard containsURLData] && [self performDragOperationForURL:info])
     return YES;
   return NO;
 }
 
 @end