Improve performance of proxy resolver by tracing DNS dependencies.

net/proxy/mock_proxy_resolver.h

 // Copyright (c) 2012 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_MOCK_PROXY_RESOLVER_H_
 #define NET_PROXY_MOCK_PROXY_RESOLVER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 58 matching lines @@
   virtual ~MockAsyncProxyResolverBase();
 
   // ProxyResolver implementation.
   virtual int GetProxyForURL(const GURL& url,
                              ProxyInfo* results,
                              const net::CompletionCallback& callback,
                              RequestHandle* request_handle,
                              const BoundNetLog& /*net_log*/) OVERRIDE;
   virtual void CancelRequest(RequestHandle request_handle) OVERRIDE;
   virtual LoadState GetLoadState(RequestHandle request_handle) const OVERRIDE;
-  virtual LoadState GetLoadStateThreadSafe(
-      RequestHandle request_handle) const OVERRIDE;
   virtual int SetPacScript(
       const scoped_refptr<ProxyResolverScriptData>& script_data,
       const net::CompletionCallback& callback) OVERRIDE;
   virtual void CancelSetPacScript() OVERRIDE;
 
   const RequestsList& pending_requests() const {
     return pending_requests_;
   }
 
   const RequestsList& cancelled_requests() const {
@@ skipping 27 matching lines @@
 
 class MockAsyncProxyResolverExpectsBytes : public MockAsyncProxyResolverBase {
  public:
   MockAsyncProxyResolverExpectsBytes()
       : MockAsyncProxyResolverBase(true /*expects_pac_bytes*/) {}
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_MOCK_PROXY_RESOLVER_H_