iwyu: Include stringprintf.h where appropriate, part 2.

chrome/service/cloud_print/cloud_print_proxy_backend.cc

 // Copyright (c) 2011 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/service/cloud_print/cloud_print_proxy_backend.h"
 
 #include <map>
 #include <vector>
 
 #include "base/file_util.h"
 #include "base/md5.h"
 #include "base/rand_util.h"
+#include "base/stringprintf.h"
 #include "base/string_number_conversions.h"
 #include "base/string_split.h"
-#include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/common/net/gaia/gaia_oauth_client.h"
 #include "chrome/service/cloud_print/cloud_print_consts.h"
 #include "chrome/service/cloud_print/cloud_print_helpers.h"
 #include "chrome/service/cloud_print/cloud_print_token_store.h"
 #include "chrome/service/cloud_print/cloud_print_url_fetcher.h"
 #include "chrome/service/cloud_print/printer_job_handler.h"
 #include "chrome/service/gaia/service_gaia_authenticator.h"
 #include "chrome/service/net/service_url_request_context.h"
@@ skipping 599 matching lines @@
                                                   std::string(), &post_data);
     CloudPrintHelpers::AddMultipartValueForUpload(kPrinterNameValue,
                                                   info.printer_name,
                                                   mime_boundary,
                                                   std::string(), &post_data);
     CloudPrintHelpers::AddMultipartValueForUpload(kPrinterDescValue,
                                                   info.printer_description,
                                                   mime_boundary,
                                                   std::string() , &post_data);
     CloudPrintHelpers::AddMultipartValueForUpload(
-        kPrinterStatusValue, StringPrintf("%d", info.printer_status),
+        kPrinterStatusValue, base::StringPrintf("%d", info.printer_status),
         mime_boundary, std::string(), &post_data);
     // Add printer options as tags.
     CloudPrintHelpers::GenerateMultipartPostDataForPrinterTags(info.options,
                                                                mime_boundary,
                                                                &post_data);
 
     CloudPrintHelpers::AddMultipartValueForUpload(
         kPrinterCapsValue, last_uploaded_printer_info_.printer_capabilities,
         mime_boundary, last_uploaded_printer_info_.caps_mime_type,
         &post_data);
@@ skipping 486 matching lines @@
   OnAuthError();
 }
 
 void CloudPrintProxyBackend::Core::OnNetworkError(int response_code) {
   // Since we specify inifinite retries on network errors, this should never
   // be called.
   NOTREACHED() <<
       "OnNetworkError invoked when not expected, response code is " <<
       response_code;
 }