pdfviewer: code cleanup - add licence on files, make replace __DEFINE__foo with foo_DEFINED to matc…

experimental/PdfViewer/SkNulCanvas.h

-#ifndef EXPERIMENTAL_PDFVIEWER_SKNULCANVAS_H_
-#define EXPERIMENTAL_PDFVIEWER_SKNULCANVAS_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 SkNulCanvas_DEFINED
+#define SkNulCanvas_DEFINED
 
 #include "SkCanvas.h"
 
 class SK_API SkNulCanvas : public SkCanvas {
 public:
     SK_DECLARE_INST_COUNT(SkNulCanvas);
 
     SkNulCanvas() {}
     explicit SkNulCanvas(SkDevice* device) : SkCanvas(device) {}
 
@@ skipping 68 matching lines @@
     virtual SkDrawFilter* setDrawFilter(SkDrawFilter* filter) {return NULL;}
 
 protected:
     virtual SkCanvas* canvasForDrawIter() {return NULL;}
     virtual SkDevice* setDevice(SkDevice* device) {return NULL;}
 
 private:
     typedef SkCanvas INHERITED;
 };
 
-#endif  // EXPERIMENTAL_PDFVIEWER_SKNULCANVAS_H_
+#endif  // SkNulCanvas_DEFINED