Change ppapi C++ comment style into C.

ppapi/c/dev/ppb_cursor_control_dev.h

Index: ppapi/c/dev/ppb_cursor_control_dev.h
diff --git a/ppapi/c/dev/ppb_cursor_control_dev.h b/ppapi/c/dev/ppb_cursor_control_dev.h
index c515af7d8ea7787006db9945facd26420fdc4606..104f6c589a80b47c3bb9d3ed98c3dd9dfb8f2398 100644
--- a/ppapi/c/dev/ppb_cursor_control_dev.h
+++ b/ppapi/c/dev/ppb_cursor_control_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_PPB_CURSOR_CONTROL_DEV_H_
 #define PPAPI_C_DEV_PPB_CURSOR_CONTROL_DEV_H_
 
@@ -53,4 +53,5 @@ struct PPB_CursorControl_Dev {
   PP_Bool (*CanLockCursor)(PP_Instance);
 };
 
-#endif  //  PPAPI_C_DEV_PPB_CURSOR_CONTROL_DEV_H_
+#endif  /* PPAPI_C_DEV_PPB_CURSOR_CONTROL_DEV_H_ */
+