Change ppapi C++ comment style into C.

ppapi/c/dev/deprecated_bool.h

Index: ppapi/c/dev/deprecated_bool.h
diff --git a/ppapi/c/dev/deprecated_bool.h b/ppapi/c/dev/deprecated_bool.h
index 327700f51e4c2440ff07e338cc314c2f26ab3aa8..6c66dffd12ce19b7582947c231a23cf634a02db0 100644
--- a/ppapi/c/dev/deprecated_bool.h
+++ b/ppapi/c/dev/deprecated_bool.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_DEPRECATED_BOOL_H_
 #define PPAPI_C_DEV_DEPRECATED_BOOL_H_
 
@@ -39,5 +39,5 @@ typedef char bool;
  * End addtogroup PP
  */
 
-#endif  // PPAPI_C_DEV_DEPRECATED_BOOL_H_
+#endif  /* PPAPI_C_DEV_DEPRECATED_BOOL_H_ */