Move ReadFileToString to the base namespace.

base/json/json_file_value_serializer.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 "base/json/json_file_value_serializer.h"
 
 #include "base/file_util.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/logging.h"
 
@@ skipping 28 matching lines @@
   if (file_util::WriteFile(json_file_path_,
                            json_string.data(),
                            data_size) != data_size)
     return false;
 
   return true;
 }
 
 int JSONFileValueSerializer::ReadFileToString(std::string* json_string) {
   DCHECK(json_string);
-  if (!file_util::ReadFileToString(json_file_path_, json_string)) {
+  if (!base::ReadFileToString(json_file_path_, json_string)) {
 #if defined(OS_WIN)
     int error = ::GetLastError();
     if (error == ERROR_SHARING_VIOLATION || error == ERROR_LOCK_VIOLATION) {
       return JSON_FILE_LOCKED;
     } else if (error == ERROR_ACCESS_DENIED) {
       return JSON_ACCESS_DENIED;
     }
 #endif
     if (!base::PathExists(json_file_path_))
       return JSON_NO_SUCH_FILE;
@@ skipping 30 matching lines @@
       *error_code = error;
     if (error_str)
       *error_str = GetErrorMessageForCode(error);
     return NULL;
   }
 
   JSONStringValueSerializer serializer(json_string);
   serializer.set_allow_trailing_comma(allow_trailing_comma_);
   return serializer.Deserialize(error_code, error_str);
 }