[Cleanup] Remove StringPrintf from global namespace

net/http/proxy_client_socket.cc

 // Copyright (c) 2012 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/proxy_client_socket.h"
 
 #include "base/metrics/histogram.h"
 #include "base/stringprintf.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
 #include "net/http/http_auth_controller.h"
 #include "net/http/http_request_info.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_response_info.h"
 
 namespace net {
 
 // static
 void ProxyClientSocket::BuildTunnelRequest(
     const HttpRequestInfo& request_info,
     const HttpRequestHeaders& auth_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 49 matching lines @@
                          location.c_str());
   std::string raw_headers =
       HttpUtil::AssembleRawHeaders(fake_response_headers.data(),
                                    fake_response_headers.length());
   response->headers = new HttpResponseHeaders(raw_headers);
 
   return true;
 }
 
 }  // namespace net