net: Append base:: in the StringPrintf calls.

net/http/http_proxy_client_socket.cc

 // Copyright (c) 2010 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 "net/http/http_proxy_client_socket.h"
 
 #include "base/string_util.h"
+#include "base/stringprintf.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/auth.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_log.h"
 #include "net/base/net_util.h"
 #include "net/http/http_net_log_params.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_request_info.h"
 #include "net/http/http_stream_parser.h"
 #include "net/socket/client_socket_handle.h"
 
 namespace net {
 
 namespace {
 
 // The HTTP CONNECT method for establishing a tunnel connection is documented
 // in draft-luotonen-web-proxy-tunneling-01.txt and RFC 2817, Sections 5.2 and
 // 5.3.
 void BuildTunnelRequest(const HttpRequestInfo* request_info,
                         const HttpRequestHeaders& authorization_headers,
                         const HostPortPair& endpoint,
                         std::string* request_line,
                         HttpRequestHeaders* request_headers) {
   // RFC 2616 Section 9 says the Host request-header field MUST accompany all
   // HTTP/1.1 requests.  Add "Proxy-Connection: keep-alive" for compat with
   // HTTP/1.0 proxies such as Squid (required for NTLM authentication).
-  *request_line = StringPrintf(
+  *request_line = base::StringPrintf(
       "CONNECT %s HTTP/1.1\r\n", endpoint.ToString().c_str());
   request_headers->SetHeader(HttpRequestHeaders::kHost,
                              GetHostAndOptionalPort(request_info->url));
   request_headers->SetHeader(HttpRequestHeaders::kProxyConnection,
                              "keep-alive");
 
   std::string user_agent;
   if (request_info->extra_headers.GetHeader(HttpRequestHeaders::kUserAgent,
                                             &user_agent))
     request_headers->SetHeader(HttpRequestHeaders::kUserAgent, user_agent);
@@ skipping 429 matching lines @@
 
   int rv = auth_->HandleAuthChallenge(response_.headers, false, true, net_log_);
   response_.auth_challenge = auth_->auth_info();
   if (rv == OK)
     return ERR_PROXY_AUTH_REQUESTED;
 
   return rv;
 }
 
 }  // namespace net