Clean up cloud printing aura stub code.

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_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<PrintingContextGtk*>(context)->PrintDocument(
-          page.metafile());
-    }
-  }
-#endif  // !defined(OS_CHROMEOS)
-}
-
-}  // namespace printing