Connect the right metafiles for print preview on Linux and Windows.

printing/metafile_impl.h

Index: printing/metafile_impl.h
diff --git a/printing/metafile_impl.h b/printing/metafile_impl.h
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+// 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.
+
+#ifndef PRINTING_METAFILE_IMPL_H_
+#define PRINTING_METAFILE_IMPL_H_
+
+#if defined(OS_WIN)
+#include "printing/emf_win.h"
+#include "printing/pdf_metafile_skia.h"
+#elif defined(OS_MACOSX)
+#include "printing/pdf_metafile_cg_mac.h"
+#elif defined(OS_POSIX)
+#include "printing/pdf_metafile_cairo_linux.h"
+#include "printing/pdf_metafile_skia.h"
+#endif
+
+namespace printing {
+
+#if defined(OS_WIN)
+typedef Emf NativeMetafile;
+typedef PdfMetafileSkia PreviewMetafile;
+#elif defined(OS_MACOSX)
+typedef PdfMetafileCg NativeMetafile;
+typedef PdfMetafileCg PreviewMetafile;
+#elif defined(OS_POSIX)
+typedef PdfMetafileCairo NativeMetafile;
+typedef PdfMetafileSkia PreviewMetafile;
+#endif
+
+}  // namespace printing
+
+#endif  // PRINTING_METAFILE_IMPL_H_