Improve performance of proxy resolver by tracing DNS dependencies.

net/proxy/mock_proxy_resolver.cc

 // Copyright (c) 2011 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/mock_proxy_resolver.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 
 namespace net {
@@ skipping 61 matching lines @@
   cancelled_requests_.push_back(request);
   RemovePendingRequest(request);
 }
 
 LoadState MockAsyncProxyResolverBase::GetLoadState(
     RequestHandle request_handle) const {
   NOTREACHED();
   return LOAD_STATE_IDLE;
 }
 
-LoadState MockAsyncProxyResolverBase::GetLoadStateThreadSafe(
-    RequestHandle request_handle) const {
-  NOTREACHED();
-  return LOAD_STATE_IDLE;
-}
-
 int MockAsyncProxyResolverBase::SetPacScript(
     const scoped_refptr<ProxyResolverScriptData>& script_data,
     const CompletionCallback& callback) {
   DCHECK(!pending_set_pac_script_request_.get());
   pending_set_pac_script_request_.reset(
       new SetPacScriptRequest(this, script_data, callback));
   // Finished when user calls SetPacScriptRequest::CompleteNow().
   return ERR_IO_PENDING;
 }
 
@@ skipping 16 matching lines @@
 void MockAsyncProxyResolverBase::RemovePendingSetPacScriptRequest(
     SetPacScriptRequest* request) {
   DCHECK_EQ(request, pending_set_pac_script_request());
   pending_set_pac_script_request_.reset();
 }
 
 MockAsyncProxyResolverBase::MockAsyncProxyResolverBase(bool expects_pac_bytes)
     : ProxyResolver(expects_pac_bytes) {}
 
 }  // namespace net