Move ReadFileToString to the base namespace.

cloud_print/service/win/chrome_launcher.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 "cloud_print/service/win/chrome_launcher.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 97 matching lines @@
   url = net::AppendQueryParameter(url, "service", "cloudprint");
   url = net::AppendQueryParameter(url, "sarp", "1");
   return net::AppendQueryParameter(
       url, "continue", GetCloudPrintServiceEnableURL(proxy_id).spec());
 }
 
 std::string ReadAndUpdateServiceState(const base::FilePath& directory,
                                       const std::string& proxy_id) {
   std::string json;
   base::FilePath file_path = directory.Append(chrome::kServiceStateFileName);
-  if (!file_util::ReadFileToString(file_path, &json)) {
+  if (!base::ReadFileToString(file_path, &json)) {
     return std::string();
   }
 
   scoped_ptr<base::Value> service_state(base::JSONReader::Read(json));
   base::DictionaryValue* dictionary = NULL;
   if (!service_state->GetAsDictionary(&dictionary) || !dictionary) {
     return std::string();
   }
 
   bool enabled = false;
@@ skipping 208 matching lines @@
       }
     } else {
       LOG(ERROR) << "Chrome launch failed.";
       return result;
     }
   }
   NOTREACHED();
   return std::string();
 }