Refactor PPB_NetworkMonitor_Private interface to use CompletionCallback.

ppapi/thunk/resource_creation_api.h

Index: ppapi/thunk/resource_creation_api.h
diff --git a/ppapi/thunk/resource_creation_api.h b/ppapi/thunk/resource_creation_api.h
index 49307559f7eb3a9539141f16048e0c00390cd30e..3588e0207fb76fd5b344fbb8ababf7ae9e59c424 100644
--- a/ppapi/thunk/resource_creation_api.h
+++ b/ppapi/thunk/resource_creation_api.h
@@ -147,10 +147,7 @@ class ResourceCreationAPI {
   virtual PP_Resource CreateNetAddressFromNetAddressPrivate(
       PP_Instance instance,
       const PP_NetAddress_Private& private_addr) = 0;
-  virtual PP_Resource CreateNetworkMonitor(
-      PP_Instance instance,
-      PPB_NetworkMonitor_Callback callback,
-      void* user_data) = 0;
+  virtual PP_Resource CreateNetworkMonitor(PP_Instance instance) = 0;
   virtual PP_Resource CreatePrinting(PP_Instance instance) = 0;
   virtual PP_Resource CreateTCPServerSocketPrivate(PP_Instance instance) = 0;
   virtual PP_Resource CreateTCPSocket(PP_Instance instace) = 0;