Rename EME WD call parameters

ppapi/proxy/ppp_content_decryptor_private_proxy.h

Index: ppapi/proxy/ppp_content_decryptor_private_proxy.h
diff --git a/ppapi/proxy/ppp_content_decryptor_private_proxy.h b/ppapi/proxy/ppp_content_decryptor_private_proxy.h
index 192ab5f8d4a78ce69ca268013cf73fa17e052ddd..dfbcf4f5d42806e575ea56395595266a83220d5b 100644
--- a/ppapi/proxy/ppp_content_decryptor_private_proxy.h
+++ b/ppapi/proxy/ppp_content_decryptor_private_proxy.h
@@ -33,13 +33,13 @@ class PPP_ContentDecryptor_Private_Proxy : public InterfaceProxy {
   void OnMsgInitialize(PP_Instance instance,
                        SerializedVarReceiveInput key_system);
   void OnMsgCreateSession(PP_Instance instance,
-                          uint32_t reference_id,
+                          uint32_t session_id,
                           SerializedVarReceiveInput type,
                           SerializedVarReceiveInput init_data);
   void OnMsgUpdateSession(PP_Instance instance,
-                          uint32_t reference_id,
+                          uint32_t session_id,
                           SerializedVarReceiveInput response);
-  void OnMsgReleaseSession(PP_Instance instance, uint32_t reference_id);
+  void OnMsgReleaseSession(PP_Instance instance, uint32_t session_id);
   void OnMsgDecrypt(PP_Instance instance,
                     const PPPDecryptor_Buffer& encrypted_buffer,
                     const std::string& serialized_encrypted_block_info);