Split ProxyResolverV8Tracing into an implementation and a wrapper.

net/interfaces/proxy_resolver_service.mojom

 // 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.
 
 // Put Mojo definitions into their own namespace to avoid collisions with C++
 // definitions.
 // TODO(amistry): Resolve the conflict between these two sets of definitions.
 module net.interfaces;
 
 import "host_resolver_service.mojom";
@@ skipping 13 matching lines @@
 struct ProxyServer {
   ProxyScheme scheme;
 
   // |host| and |port| are only valid if |scheme| is not INVALID or DIRECT.
   string? host;
   uint16 port;
 };
 
 interface ProxyResolver {
   // Use a ProxyResolverRequestClient instead of returning a result so we can
-  // receive load state updates and cancel in-flight requests by destroying the
-  // client.
+  // cancel in-flight requests by destroying the client.
   // TODO(amistry): Add BoundNetLog.
   GetProxyForUrl(string url, ProxyResolverRequestClient client);
 };
 
 interface ProxyResolverRequestClient {
   ReportResult(int32 error, array<ProxyServer>? proxy_servers);
-  LoadStateChanged(int32 load_state);
 };
 
 interface ProxyResolverErrorObserver {
   OnPacScriptError(int32 line_number, string error);
 };
 
 interface ProxyResolverFactory {
   // TODO(amistry): Add NetLog.
   CreateResolver(string pac_script,
                  ProxyResolver& resolver,
                  HostResolver host_resolver,
                  ProxyResolverErrorObserver? error_observer,
                  ProxyResolverFactoryRequestClient client);
 };
 
 interface ProxyResolverFactoryRequestClient {
   ReportResult(int32 error);
 };