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 88f99e325a58f26cd94407b5288a1e31c225f905..5d5b2ecdfe6f5ec7ee0e6eeb0210d8420350e9b3 100644
--- a/ppapi/proxy/resource_creation_proxy.cc
+++ b/ppapi/proxy/resource_creation_proxy.cc
@@ -296,12 +296,9 @@ 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::CreateNetworkMonitorPrivate(
+    PP_Instance instance) {
+  return PPB_NetworkMonitor_Private_Proxy::CreateProxyResource(instance);
 }
 
 PP_Resource ResourceCreationProxy::CreatePrinting(PP_Instance instance) {