chromeos: Simplify D-Bus proxy provider (but not tests).

chrome/browser/chromeos/dbus/chrome_proxy_resolution_service_provider_delegate.cc

 // Copyright 2014 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 "chrome/browser/chromeos/dbus/chrome_proxy_resolution_service_provider_delegate.h"
 
 #include "chrome/browser/profiles/profile_manager.h"
-#include "net/log/net_log_with_source.h"
-#include "net/proxy/proxy_service.h"
 #include "net/url_request/url_request_context_getter.h"
 
 namespace chromeos {
 
 ChromeProxyResolutionServiceProviderDelegate::
     ChromeProxyResolutionServiceProviderDelegate() {}
 
 ChromeProxyResolutionServiceProviderDelegate::
     ~ChromeProxyResolutionServiceProviderDelegate() {}
 
 scoped_refptr<net::URLRequestContextGetter>
 ChromeProxyResolutionServiceProviderDelegate::GetRequestContext() {
   Profile* profile = ProfileManager::GetPrimaryUserProfile();
   return profile->GetRequestContext();
 }
 
-int ChromeProxyResolutionServiceProviderDelegate::ResolveProxy(
-    net::ProxyService* proxy_service,
-    const GURL& url,
-    net::ProxyInfo* results,
-    const net::CompletionCallback& callback) {
-  DCHECK(proxy_service);
-  DCHECK(results);
-  return proxy_service->ResolveProxy(url, std::string(), results, callback,
-                                     nullptr, nullptr, net::NetLogWithSource());
-}
-
 }  // namespace chromeos