base::Bind: Convert most of net/http.

net/http/http_proxy_client_socket.h

Index: net/http/http_proxy_client_socket.h
diff --git a/net/http/http_proxy_client_socket.h b/net/http/http_proxy_client_socket.h
index 831e3efe5ec79f747204893888b5f50c36d99ad2..20e9ca446b95f609446ac11f2956f42ed170c9af 100644
--- a/net/http/http_proxy_client_socket.h
+++ b/net/http/http_proxy_client_socket.h
@@ -53,7 +53,7 @@ class HttpProxyClientSocket : public ProxyClientSocket {
   // If Connect (or its callback) returns PROXY_AUTH_REQUESTED, then
   // credentials should be added to the HttpAuthController before calling
   // RestartWithAuth.
-  int RestartWithAuth(OldCompletionCallback* callback);
+  int RestartWithAuth(const CompletionCallback& callback);
 
   const scoped_refptr<HttpAuthController>& auth_controller() {
     return auth_;
@@ -135,7 +135,7 @@ class HttpProxyClientSocket : public ProxyClientSocket {
   int DoTCPRestart();
   int DoTCPRestartComplete(int result);
 
-  OldCompletionCallbackImpl<HttpProxyClientSocket> io_callback_;
+  CompletionCallback io_callback_;
   State next_state_;
 
   // Stores the callback to the layer above, called on completing Connect().