NaCl: Remove getpid() calls from the PPAPI proxy

ppapi/native_client/src/shared/ppapi_proxy/ppp_rpc_client.cc

Index: ppapi/native_client/src/shared/ppapi_proxy/ppp_rpc_client.cc
diff --git a/ppapi/native_client/src/shared/ppapi_proxy/ppp_rpc_client.cc b/ppapi/native_client/src/shared/ppapi_proxy/ppp_rpc_client.cc
index 636aee16f358f564608ec6e2340e6f52578feaef..15cf71d558edf13626dca6fff028f383dc880372 100644
--- a/ppapi/native_client/src/shared/ppapi_proxy/ppp_rpc_client.cc
+++ b/ppapi/native_client/src/shared/ppapi_proxy/ppp_rpc_client.cc
@@ -40,21 +40,17 @@ NaClSrpcError CompletionCallbackRpcClient::RunCompletionCallback(
 
 NaClSrpcError PppRpcClient::PPP_InitializeModule(
     NaClSrpcChannel* channel,
-    int32_t pid,
     PP_Module module,
     NaClSrpcImcDescType upcall_channel_desc,
     const char* service_description,
-    int32_t* nacl_pid,
     int32_t* success)  {
   NaClSrpcError retval;
   retval = NaClSrpcInvokeBySignature(
       channel,
-      "PPP_InitializeModule:iihs:ii",
-      pid,
+      "PPP_InitializeModule:ihs:i",
       module,
       upcall_channel_desc,
       service_description,
-      nacl_pid,
       success
   );
   return retval;