Refactor PPB_NetworkMonitor_Private interface to use CompletionCallback.

ppapi/proxy/resource_creation_proxy.cc

Index: ppapi/proxy/resource_creation_proxy.cc
diff --git a/ppapi/proxy/resource_creation_proxy.cc b/ppapi/proxy/resource_creation_proxy.cc
index 4814c978aa771e44f79b0a4f9044ecddfe5bd1cf..87f9034ee44ab75f90ee3d1ed113c7bae7e0e688 100644
--- a/ppapi/proxy/resource_creation_proxy.cc
+++ b/ppapi/proxy/resource_creation_proxy.cc
@@ -301,12 +301,8 @@ PP_Resource ResourceCreationProxy::CreateNetAddressFromNetAddressPrivate(
                                  private_addr))->GetReference();
 }
 
-PP_Resource ResourceCreationProxy::CreateNetworkMonitor(
-    PP_Instance instance,
-    PPB_NetworkMonitor_Callback callback,
-    void* user_data) {
-  return PPB_NetworkMonitor_Private_Proxy::CreateProxyResource(
-      instance, callback, user_data);
+PP_Resource ResourceCreationProxy::CreateNetworkMonitor(PP_Instance instance) {
+  return PPB_NetworkMonitor_Private_Proxy::CreateProxyResource(instance);
 }
 
 PP_Resource ResourceCreationProxy::CreatePrinting(PP_Instance instance) {