Move RefCountedMemory class to base namespace.

chrome/browser/ui/webui/ntp/thumbnail_source.h

Index: chrome/browser/ui/webui/ntp/thumbnail_source.h
===================================================================
--- chrome/browser/ui/webui/ntp/thumbnail_source.h	(revision 134496)
+++ chrome/browser/ui/webui/ntp/thumbnail_source.h	(working copy)
@@ -10,11 +10,14 @@
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/ref_counted_memory.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 
 class Profile;
 
+namespace base {
+class RefCountedMemory;
+}
+
 namespace history {
 class TopSites;
 }
@@ -44,7 +47,7 @@
 
   // Raw PNG representation of the thumbnail to show when the thumbnail
   // database doesn't have a thumbnail for a webpage.
-  scoped_refptr<RefCountedMemory> default_thumbnail_;
+  scoped_refptr<base::RefCountedMemory> default_thumbnail_;
 
   // TopSites.
   scoped_refptr<history::TopSites> top_sites_;