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

printing/printing_context_cairo.h

Index: printing/printing_context_cairo.h
diff --git a/printing/printing_context_cairo.h b/printing/printing_context_cairo.h
index 3002b06d1314f2726faee8301bcd4a066c52309d..2326dead5620035632bc0cab6ab0f5cfcbcc907c 100644
--- a/printing/printing_context_cairo.h
+++ b/printing/printing_context_cairo.h
@@ -9,12 +9,9 @@
 
 #include "printing/printing_context.h"
 
-#if !defined(OS_CHROMEOS)
-#include "printing/native_metafile.h"
-#endif
-
 namespace printing {
 
+class Metafile;
 class PrintDialogGtkInterface;
 
 class PrintingContextCairo : public PrintingContext {
@@ -29,7 +26,7 @@ class PrintingContextCairo : public PrintingContext {
           PrintingContextCairo* context));
 
   // Prints the document contained in |metafile|.
-  void PrintDocument(const NativeMetafile* metafile);
+  void PrintDocument(const Metafile* metafile);
 #endif
 
   // PrintingContext implementation.