Implement PPB_NetworkMonitor_Private Pepper interface.

webkit/plugins/ppapi/mock_plugin_delegate.cc

Index: webkit/plugins/ppapi/mock_plugin_delegate.cc
diff --git a/webkit/plugins/ppapi/mock_plugin_delegate.cc b/webkit/plugins/ppapi/mock_plugin_delegate.cc
index 91824d7b2d2b349f4fa55adeba484642a6d3edd0..81a0690a8072e4ff32b543ff058dac34258dd023 100644
--- a/webkit/plugins/ppapi/mock_plugin_delegate.cc
+++ b/webkit/plugins/ppapi/mock_plugin_delegate.cc
@@ -314,6 +314,15 @@ void MockPluginDelegate::TCPServerSocketStopListening(uint32 real_socket_id,
                                                       uint32 temp_socket_id) {
 }
 
+bool MockPluginDelegate::AddNetworkListObserver(
+    webkit_glue::NetworkListObserver* observer) {
+  return false;
+}
+
+void MockPluginDelegate::RemoveNetworkListObserver(
+    webkit_glue::NetworkListObserver* observer) {
+}
+
 int32_t MockPluginDelegate::ShowContextMenu(
     PluginInstance* instance,
     webkit::ppapi::PPB_Flash_Menu_Impl* menu,