NaCl: Remove getpid() calls from the PPAPI proxy

ppapi/native_client/src/shared/ppapi_proxy/ppp.srpc

Index: ppapi/native_client/src/shared/ppapi_proxy/ppp.srpc
diff --git a/ppapi/native_client/src/shared/ppapi_proxy/ppp.srpc b/ppapi/native_client/src/shared/ppapi_proxy/ppp.srpc
index 9ce32e1de0d7cb35830cf554896481078816e34a..f97b0739345c1cbb585868ccb6496d2f236d0eff 100644
--- a/ppapi/native_client/src/shared/ppapi_proxy/ppp.srpc
+++ b/ppapi/native_client/src/shared/ppapi_proxy/ppp.srpc
@@ -10,13 +10,11 @@
           # PPP_Initialize is called once to initialize the plugin.
           # It is effectively a class initializer for the plugin type.
           {'name': 'PPP_InitializeModule',
-           'inputs': [['pid', 'int32_t'],
-                      ['module', 'PP_Module'],
+           'inputs': [['module', 'PP_Module'],
                       ['upcall_channel_desc', 'handle'],
                       ['service_description', 'string'],
                      ],
-           'outputs': [['nacl_pid', 'int32_t'],
-                       ['success', 'int32_t'],
+           'outputs': [['success', 'int32_t'],
                       ]
           },
           # PPP_ShutdownModule stops the plugin.