Change HostResolver::Resolve() to take an std::unique_ptr<Request>* rather than a RequestHandle*

extensions/browser/api/socket/socket_api.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_API_SOCKET_SOCKET_API_H_
 #define EXTENSIONS_BROWSER_API_SOCKET_SOCKET_API_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 140 matching lines @@
   ~SocketExtensionWithDnsLookupFunction() override;
 
   // AsyncApiFunction:
   bool PrePrepare() override;
 
   void StartDnsLookup(const net::HostPortPair& host_port_pair);
   virtual void AfterDnsLookup(int lookup_result) = 0;
 
   net::AddressList addresses_;
 
+  std::unique_ptr<net::HostResolver::Request> request_;
+
  private:
   void OnDnsLookup(int resolve_result);
 
   // Weak pointer to the resource context.
   content::ResourceContext* resource_context_;
 };
 
 class SocketCreateFunction : public SocketAsyncApiFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("socket.create", SOCKET_CREATE)
@@ skipping 380 matching lines @@
 
   std::unique_ptr<api::socket::Secure::Params> params_;
   scoped_refptr<net::URLRequestContextGetter> url_request_getter_;
 
   DISALLOW_COPY_AND_ASSIGN(SocketSecureFunction);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_SOCKET_SOCKET_API_H_