Add support for ProxyResolverErrorObserver to ProxyResolverMojo.

net/proxy/mojo_proxy_resolver_factory_impl.h

Index: net/proxy/mojo_proxy_resolver_factory_impl.h
diff --git a/net/proxy/mojo_proxy_resolver_factory_impl.h b/net/proxy/mojo_proxy_resolver_factory_impl.h
index 5a4eee2f4cbde253b71c26d9a7c7e270c00dbedb..6332c92833bee66354cf0d3dc89a86cab4aa0642 100644
--- a/net/proxy/mojo_proxy_resolver_factory_impl.h
+++ b/net/proxy/mojo_proxy_resolver_factory_impl.h
@@ -12,11 +12,13 @@
 
 namespace net {
 class HostResolver;
+class ProxyResolverErrorObserver;
 
 class MojoProxyResolverFactoryImpl : public interfaces::ProxyResolverFactory {
  public:
   using Factory = base::Callback<scoped_ptr<ProxyResolver>(
       HostResolver*,
+      scoped_ptr<ProxyResolverErrorObserver>,
       const ProxyResolver::LoadStateChangedCallback&)>;
 
   explicit MojoProxyResolverFactoryImpl(
@@ -29,8 +31,10 @@ class MojoProxyResolverFactoryImpl : public interfaces::ProxyResolverFactory {
 
  private:
   // interfaces::ProxyResolverFactory override.
-  void CreateResolver(mojo::InterfaceRequest<interfaces::ProxyResolver> request,
-                      interfaces::HostResolverPtr host_resolver) override;
+  void CreateResolver(
+      mojo::InterfaceRequest<interfaces::ProxyResolver> request,
+      interfaces::HostResolverPtr host_resolver,
+      interfaces::ProxyResolverErrorObserverPtr error_observer) override;
 
   const Factory proxy_resolver_impl_factory_;
   mojo::StrongBinding<interfaces::ProxyResolverFactory> binding_;