Use CapabilityFilter to restrict what HTMLViewers can connect to.

mojo/application/public/cpp/lib/service_registry.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/application/public/cpp/lib/service_registry.h"
 
 #include "base/logging.h"
 #include "mojo/application/public/cpp/application_connection.h"
 #include "mojo/application/public/cpp/service_connector.h"
 
@@ skipping 33 matching lines @@
 
 bool ServiceRegistry::SetServiceConnectorForName(
     ServiceConnector* service_connector,
     const std::string& interface_name) {
   if (allow_all_interfaces_ ||
       allowed_interfaces_.count(interface_name)) {
     service_connector_registry_.SetServiceConnectorForName(service_connector,
                                                            interface_name);
     return true;
   }
-  DVLOG(2) << "CapabilityFilter prevented connection to interface: " <<
+  LOG(WARNING) << "CapabilityFilter prevented connection to interface: " <<
       interface_name;
   return false;
 }
 
 ServiceProvider* ServiceRegistry::GetLocalServiceProvider() {
   return this;
 }
 
 void ServiceRegistry::SetRemoteServiceProviderConnectionErrorHandler(
     const Closure& handler) {
@@ skipping 24 matching lines @@
 }
 
 void ServiceRegistry::ConnectToService(const mojo::String& service_name,
                                        ScopedMessagePipeHandle client_handle) {
   service_connector_registry_.ConnectToService(this, service_name,
                                                client_handle.Pass());
 }
 
 }  // namespace internal
 }  // namespace mojo