Shut down proxy resolver utility processes when no longer needed.

net/proxy/in_process_mojo_proxy_resolver_factory.cc

 // Copyright 2015 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 "net/proxy/in_process_mojo_proxy_resolver_factory.h"
 
 #include "base/memory/singleton.h"
 #include "net/proxy/mojo_proxy_resolver_factory_impl.h"
 
 namespace net {
 
 // static
 InProcessMojoProxyResolverFactory*
 InProcessMojoProxyResolverFactory::GetInstance() {
   return Singleton<InProcessMojoProxyResolverFactory>::get();
 }
 
 InProcessMojoProxyResolverFactory::InProcessMojoProxyResolverFactory() {
   // Implementation lifetime is strongly bound to the life of the connection via
   // |factory_|. When |factory_| is destroyed, the Mojo connection is terminated
   // which causes this object to be destroyed.
   new MojoProxyResolverFactoryImpl(mojo::GetProxy(&factory_));
 }
 
 InProcessMojoProxyResolverFactory::~InProcessMojoProxyResolverFactory() =
     default;
 
-void InProcessMojoProxyResolverFactory::CreateResolver(
+scoped_ptr<base::ScopedClosureRunner>
+InProcessMojoProxyResolverFactory::CreateResolver(
     const mojo::String& pac_script,
     mojo::InterfaceRequest<interfaces::ProxyResolver> req,
     interfaces::HostResolverPtr host_resolver,
     interfaces::ProxyResolverFactoryRequestClientPtr client) {
   factory_->CreateResolver(pac_script, req.Pass(), host_resolver.Pass(),
                            client.Pass());
+  return nullptr;
 }
 
 }  // namespace net