Split ProxyResolverV8Tracing into an implementation and a wrapper.

net/proxy/mojo_proxy_resolver_impl.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_IMPL_H_
 #define NET_PROXY_MOJO_PROXY_RESOLVER_IMPL_H_
 
 #include <map>
 #include <queue>
 #include <set>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/interfaces/proxy_resolver_service.mojom.h"
 #include "net/proxy/proxy_resolver.h"
 
 namespace net {
 
 class MojoProxyResolverImpl : public interfaces::ProxyResolver {
  public:
-  MojoProxyResolverImpl(
-      scoped_ptr<net::ProxyResolver> resolver,
-      const base::Callback<
-          void(const net::ProxyResolver::LoadStateChangedCallback&)>&
-          load_state_change_callback_setter);
+  explicit MojoProxyResolverImpl(scoped_ptr<net::ProxyResolver> resolver);
 
   ~MojoProxyResolverImpl() override;
 
  private:
   class Job;
 
   // interfaces::ProxyResolver overrides.
   void GetProxyForUrl(
       const mojo::String& url,
       interfaces::ProxyResolverRequestClientPtr client) override;
 
   void DeleteJob(Job* job);
 
-  // Invoked when the LoadState of a request changes.
-  void LoadStateChanged(net::ProxyResolver::RequestHandle handle,
-                        LoadState load_state);
-
   scoped_ptr<net::ProxyResolver> resolver_;
   std::set<Job*> resolve_jobs_;
   std::map<net::ProxyResolver::RequestHandle, Job*> request_handle_to_job_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoProxyResolverImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_MOJO_PROXY_RESOLVER_IMPL_H_