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

experimental/PdfViewer/SkNulCanvas.h

Index: experimental/PdfViewer/SkNulCanvas.h
===================================================================
--- experimental/PdfViewer/SkNulCanvas.h	(revision 10721)
+++ experimental/PdfViewer/SkNulCanvas.h	(working copy)
@@ -1,6 +1,13 @@
-#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 {
@@ -88,4 +95,4 @@
     typedef SkCanvas INHERITED;
 };
 
-#endif  // EXPERIMENTAL_PDFVIEWER_SKNULCANVAS_H_
+#endif  // SkNulCanvas_DEFINED