Add utf_string_conversions to base namespace.

chrome/common/child_process_logging_mac.mm

 // 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 "chrome/common/child_process_logging.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/command_line.h"
 #include "base/string_split.h"
@@ skipping 77 matching lines @@
   SetActiveURLImpl(url, SetCrashKeyValue, ClearCrashKey);
 }
 
 void SetClientId(const std::string& client_id) {
   std::string str(client_id);
   ReplaceSubstringsAfterOffset(&str, 0, "-", "");
 
   base::strlcpy(g_client_id, str.c_str(), kClientIdSize);
     SetClientIdImpl(str, SetCrashKeyValue);
 
-  std::wstring wstr = ASCIIToWide(str);
+  std::wstring wstr = base::ASCIIToWide(str);
   GoogleUpdateSettings::SetMetricsId(wstr);
 }
 
 std::string GetClientId() {
   return std::string(g_client_id);
 }
 
 void SetActiveExtensions(const std::set<std::string>& extension_ids) {
   // Log the count separately to track heavy users.
   const int count = static_cast<int>(extension_ids.size());
@@ skipping 123 matching lines @@
                    base::StringPrintf("%zu", experiments.size()));
 }
 
 void SetChannel(const std::string& channel) {
   // This should match the corresponding string in breakpad_win.cc.
   const std::string kChannelKey = "channel";
   SetCrashKeyValue(kChannelKey, channel);
 }
 
 }  // namespace child_process_logging