Fixup incorrect include guards.
This CL updates include guards throughout the code base to be in the
chromium style.
BUG=pdfium:65
R=tsepez@chromium.org
Review URL: https://codereview.chromium.org/1707893004 .
diff --git a/samples/image_diff_png.h b/samples/image_diff_png.h
index 7e0afec..7bb395a 100644
--- a/samples/image_diff_png.h
+++ b/samples/image_diff_png.h
@@ -2,8 +2,8 @@
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
-#ifndef TOOLS_IMAGEDIFF_IMAGE_DIFF_PNG_H_
-#define TOOLS_IMAGEDIFF_IMAGE_DIFF_PNG_H_
+#ifndef SAMPLES_IMAGE_DIFF_PNG_H_
+#define SAMPLES_IMAGE_DIFF_PNG_H_
#include <stdlib.h> // for size_t.
@@ -35,4 +35,4 @@
} // namespace image_diff_png
-#endif // TOOLS_IMAGEDIFF_IMAGE_DIFF_PNG_H_
+#endif // SAMPLES_IMAGE_DIFF_PNG_H_