PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_websocket_thunk.cc

Index: ppapi/thunk/ppb_websocket_thunk.cc
diff --git a/ppapi/thunk/ppb_websocket_thunk.cc b/ppapi/thunk/ppb_websocket_thunk.cc
index e83293ca4361da94aef94d4fec2df8ebb1ac4e26..81ec534ad3952de9d21c093709d1de59eaea4476 100644
--- a/ppapi/thunk/ppb_websocket_thunk.cc
+++ b/ppapi/thunk/ppb_websocket_thunk.cc
@@ -37,7 +37,7 @@ int32_t Connect(PP_Resource resource,
   if (enter.failed())
     return enter.retval();
   return enter.SetResult(enter.object()->Connect(
-      url, protocols, protocol_count, callback));
+      url, protocols, protocol_count, enter.callback()));
 }
 
 int32_t Close(PP_Resource resource,
@@ -47,7 +47,7 @@ int32_t Close(PP_Resource resource,
   EnterWebSocket enter(resource, callback, false);
   if (enter.failed())
     return enter.retval();
-  return enter.SetResult(enter.object()->Close(code, reason, callback));
+  return enter.SetResult(enter.object()->Close(code, reason, enter.callback()));
 }
 
 int32_t ReceiveMessage(PP_Resource resource,
@@ -56,7 +56,8 @@ int32_t ReceiveMessage(PP_Resource resource,
   EnterWebSocket enter(resource, callback, false);
   if (enter.failed())
     return enter.retval();
-  return enter.SetResult(enter.object()->ReceiveMessage(message, callback));
+  return enter.SetResult(enter.object()->ReceiveMessage(message,
+                                                        enter.callback()));
 }
 
 int32_t SendMessage(PP_Resource resource, PP_Var message) {