Removed NativeMetafile and PreviewMetafile typedef as it's always PdfMetafileSkia.

printing/printing_context_win.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 "printing/printing_context_win.h"
 
 #include <algorithm>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 266 matching lines @@
 
   return OK;
 }
 
 PrintingContext::Result PrintingContextWin::NewPage() {
   if (abort_printing_)
     return CANCEL;
   DCHECK(context_);
   DCHECK(in_print_job_);
 
-  // Intentional No-op. NativeMetafile::SafePlayback takes care of calling
+  // Intentional No-op. PdfMetafileSkia::SafePlayback takes care of calling
   // ::StartPage().
 
   return OK;
 }
 
 PrintingContext::Result PrintingContextWin::PageDone() {
   if (abort_printing_)
     return CANCEL;
   DCHECK(in_print_job_);
 
-  // Intentional No-op. NativeMetafile::SafePlayback takes care of calling
+  // Intentional No-op. PdfMetafileSkia::SafePlayback takes care of calling
   // ::EndPage().
 
   return OK;
 }
 
 PrintingContext::Result PrintingContextWin::DocumentDone() {
   if (abort_printing_)
     return CANCEL;
   DCHECK(in_print_job_);
   DCHECK(context_);
@@ skipping 78 matching lines @@
 
   if (canceled) {
     result.reset();
     abort_printing_ = true;
   }
 
   return result.Pass();
 }
 
 }  // namespace printing