Move RefCountedMemory class to base namespace.

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

Index: chrome/browser/ui/webui/ntp/thumbnail_source.cc
===================================================================
--- chrome/browser/ui/webui/ntp/thumbnail_source.cc	(revision 134496)
+++ chrome/browser/ui/webui/ntp/thumbnail_source.cc	(working copy)
@@ -5,6 +5,7 @@
 #include "chrome/browser/ui/webui/ntp/thumbnail_source.h"
 
 #include "base/callback.h"
+#include "base/memory/ref_counted_memory.h"
 #include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/url_constants.h"
@@ -24,7 +25,7 @@
 void ThumbnailSource::StartDataRequest(const std::string& path,
                                        bool is_incognito,
                                        int request_id) {
-  scoped_refptr<RefCountedMemory> data;
+  scoped_refptr<base::RefCountedMemory> data;
   if (top_sites_->GetPageThumbnail(GURL(path), &data)) {
     // We have the thumbnail.
     SendResponse(request_id, data.get());