Make using WebContentsUserData simpler.

chrome/browser/printing/print_view_manager.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/printing/print_view_manager.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 27 matching lines @@
 #include "grit/generated_resources.h"
 #include "printing/metafile.h"
 #include "printing/metafile_impl.h"
 #include "printing/print_destination_interface.h"
 #include "printing/printed_document.h"
 #include "ui/base/l10n/l10n_util.h"
 
 using base::TimeDelta;
 using content::BrowserThread;
 
-int printing::PrintViewManager::kUserDataKey;
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(printing::PrintViewManager)
 
 namespace {
 
 // Keeps track of pending scripted print preview closures.
 // No locking, only access on the UI thread.
 typedef std::map<content::RenderProcessHost*, base::Closure>
     ScriptedPrintPreviewClosureMap;
 static base::LazyInstance<ScriptedPrintPreviewClosureMap>
     g_scripted_print_preview_closure_map = LAZY_INSTANCE_INITIALIZER;
 
@@ skipping 624 matching lines @@
   scoped_refptr<printing::PrinterQuery> printer_query;
   print_job_manager->PopPrinterQuery(cookie, &printer_query);
   if (!printer_query.get())
     return;
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&PrinterQuery::StopWorker, printer_query.get()));
 }
 
 }  // namespace printing