Add support for ProxyResolverErrorObserver to ProxyResolverMojo.

net/proxy/mojo_proxy_resolver_factory.h

 // 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.
 
 #ifndef NET_PROXY_MOJO_PROXY_RESOLVER_FACTORY_H_
 #define NET_PROXY_MOJO_PROXY_RESOLVER_FACTORY_H_
 
 #include "net/interfaces/host_resolver_service.mojom.h"
 #include "net/interfaces/proxy_resolver_service.mojom.h"
 #include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
 
 namespace net {
 
 // Factory for connecting to Mojo ProxyResolver services.
 class MojoProxyResolverFactory {
  public:
   // Connect to a new ProxyResolver service using request |req|, using
   // |host_resolver| as the DNS resolver.
   // Note: The connection request |req| may be resolved asynchronously.
-  virtual void Create(mojo::InterfaceRequest<interfaces::ProxyResolver> req,
-                      interfaces::HostResolverPtr host_resolver) = 0;
+  virtual void Create(
+      mojo::InterfaceRequest<interfaces::ProxyResolver> req,
+      interfaces::HostResolverPtr host_resolver,
+      interfaces::ProxyResolverErrorObserverPtr error_observer) = 0;
 
  protected:
   virtual ~MojoProxyResolverFactory() = default;
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_MOJO_PROXY_RESOLVER_FACTORY_H_