PPAPI: Refactor ppapi test callbacks to ease testing blocking callbacks.

ppapi/proxy/ppb_network_monitor_private_proxy.cc

Index: ppapi/proxy/ppb_network_monitor_private_proxy.cc
diff --git a/ppapi/proxy/ppb_network_monitor_private_proxy.cc b/ppapi/proxy/ppb_network_monitor_private_proxy.cc
index 4fa2d6eec240fd16cd8c7ff12e8cbd5d5cd5a93c..e54f0ed4cdaea53ad39839ca8e56342ecc8d81af 100644
--- a/ppapi/proxy/ppb_network_monitor_private_proxy.cc
+++ b/ppapi/proxy/ppb_network_monitor_private_proxy.cc
@@ -98,9 +98,9 @@ PP_Resource PPB_NetworkMonitor_Private_Proxy::CreateProxyResource(
     // here.
     proxy->current_list_ = NULL;
   } else if (proxy->current_list_.get()) {
-    MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
+    MessageLoop::current()->PostTask(FROM_HERE, RunWhileLocked(base::Bind(
         &NetworkMonitor::OnNetworkListReceived,
-        result->AsWeakPtr(), proxy->current_list_));
+        result->AsWeakPtr(), proxy->current_list_)));
   }
 
   return result.release()->GetReference();