Get printing working in Aura.

printing/printed_document_cairo.cc

 // 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.
 
 #include "printing/printed_document.h"
 
 #include "base/logging.h"
 #include "printing/page_number.h"
 #include "printing/printed_page.h"
-#include "printing/printing_context_cairo.h"
+#include "printing/printing_context_gtk.h"
 
 namespace printing {
 
 void PrintedDocument::RenderPrintedPage(
     const PrintedPage& page, PrintingContext* context) const {
 #ifndef NDEBUG
   {
     // Make sure the page is from our list.
     base::AutoLock lock(lock_);
     DCHECK(&page == mutable_.pages_.find(page.page_number() - 1)->second.get());
   }
 #endif
 
   DCHECK(context);
 
 #if !defined(OS_CHROMEOS)
   {
     base::AutoLock lock(lock_);
     if (page.page_number() - 1 == mutable_.first_page) {
-      reinterpret_cast<PrintingContextCairo*>(context)->PrintDocument(
+      reinterpret_cast<PrintingContextGtk*>(context)->PrintDocument(
           page.metafile());
     }
   }
 #endif  // !defined(OS_CHROMEOS)
 }
 
 }  // namespace printing