Add utf_string_conversions to base namespace.

chrome/test/perf/indexeddb_uitest.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/files/file_path.h"
 #include "base/path_service.h"
 #include "base/test/test_timeouts.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/automation_constants.h"
 #include "chrome/common/chrome_paths.h"
@@ skipping 54 matching lines @@
     std::wstring json_wide;
     bool succeeded = tab->ExecuteAndExtractString(L"",
         L"window.domAutomationController.send("
         L"    JSON.stringify(automation.getResults()));",
         &json_wide);
 
     EXPECT_TRUE(succeeded);
     if (!succeeded)
       return false;
 
-    std::string json = WideToUTF8(json_wide);
+    std::string json = base::WideToUTF8(json_wide);
     return JsonDictionaryToMap(json, results);
   }
 
   void PrintResults(TabProxy* tab) {
     ResultsMap results;
     ASSERT_TRUE(GetResults(tab, &results));
 
     std::string trace_name = reference_ ? "t_ref" : "t";
 
     ResultsMap::const_iterator it = results.begin();
@@ skipping 21 matching lines @@
 
   RunTest();
 }
 
 TEST_F(IndexedDBReferenceTest, Perf) {
 
   RunTest();
 }
 
 }  // namespace