Change ppapi C++ comment style into C.

ppapi/c/dev/pp_cursor_type_dev.h

Index: ppapi/c/dev/pp_cursor_type_dev.h
diff --git a/ppapi/c/dev/pp_cursor_type_dev.h b/ppapi/c/dev/pp_cursor_type_dev.h
index a7994686cec8e3707e5f281f9e1cc931a9e95acc..454e55b67086136e65e348423acf87926daf0614 100644
--- a/ppapi/c/dev/pp_cursor_type_dev.h
+++ b/ppapi/c/dev/pp_cursor_type_dev.h
@@ -1,7 +1,7 @@
-// Copyright (c) 2010 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.
-
+/* Copyright (c) 2010 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.
+ */
 #ifndef PPAPI_C_DEV_PP_CURSORTYPE_DEV_H_
 #define PPAPI_C_DEV_PP_CURSORTYPE_DEV_H_
 
@@ -53,4 +53,5 @@ enum PP_CursorType_Dev {
 };
 PP_COMPILE_ASSERT_ENUM_SIZE_IN_BYTES(PP_CursorType_Dev, 4);
 
-#endif  // PPAPI_C_DEV_PP_CURSORTYPE_DEV_H_
+#endif  /* PPAPI_C_DEV_PP_CURSORTYPE_DEV_H_ */
+