pdfviewer: some code cleanup in renderer

experimental/PdfViewer/SkPdfRenderer.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
-#ifndef SkPdfParser_DEFINED
-#define SkPdfParser_DEFINED
-
-#include "SkPdfBasics.h"
-#include "SkPdfNativeTokenizer.h"
-
-extern "C" PdfContext* gPdfContext;
-extern "C" SkBitmap* gDumpBitmap;
-extern "C" SkCanvas* gDumpCanvas;
+#ifndef SkPdfRenderer_DEFINED
+#define SkPdfRenderer_DEFINED
 
 class SkCanvas;
 class SkNativeParsedPDF;
 
 // TODO(edisonn): move in another file
 class SkPdfRenderer : public SkRefCnt {
     SkNativeParsedPDF* fPdfDoc;
 public:
     SkPdfRenderer() : fPdfDoc(NULL) {}
     virtual ~SkPdfRenderer() {unload();}
 
     // TODO(edisonn): add options to render forms, or not
     bool renderPage(int page, SkCanvas* canvas) const;
 
     bool load(const SkString inputFileName);
     bool loaded() const {return fPdfDoc != NULL;}
     int pages() const;
     void unload();
     SkRect MediaBox(int page) const;
     size_t bytesUsed() const;
 };
 
 void reportPdfRenderStats();
 
-#endif  // SkPdfParser_DEFINED
+#endif  // SkPdfRenderer_DEFINED