Add utf_string_conversions to base namespace.

chrome/common/extensions/extension_file_util_unittest.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 "chrome/common/extensions/extension_file_util.h"
 
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/path_service.h"
@@ skipping 282 matching lines @@
       "foo/simple.html" },
   };
 #undef URL_PREFIX
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(test_cases); ++i) {
     GURL url(test_cases[i].url);
 #if defined(OS_POSIX)
     base::FilePath expected_path(test_cases[i].expected_relative_path);
 #elif defined(OS_WIN)
     base::FilePath expected_path(
-        UTF8ToWide(test_cases[i].expected_relative_path));
+        base::UTF8ToWide(test_cases[i].expected_relative_path));
 #endif
 
     base::FilePath actual_path =
         extension_file_util::ExtensionURLToRelativeFilePath(url);
     EXPECT_FALSE(actual_path.IsAbsolute()) <<
       " For the path " << actual_path.value();
     EXPECT_EQ(expected_path.value(), actual_path.value()) <<
       " For the path " << url;
   }
 }
@@ skipping 301 matching lines @@
   scoped_refptr<Extension> extension3(extension_file_util::LoadExtension(
       ext_dir, Manifest::LOAD, Extension::NO_FLAGS, &error));
   ASSERT_TRUE(extension3 == NULL);
   ASSERT_STREQ("Could not load icon 'icon.png' for page action.",
       error.c_str());
 }
 
 // TODO(aa): More tests as motivation allows. Maybe steal some from
 // ExtensionService? Many of them could probably be tested here without the
 // MessageLoop shenanigans.