Update uses of UTF conversions in chrome/common to use the base:: namespace.

chrome/common/extensions/extension_l10n_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 "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
@@ skipping 30 matching lines @@
   std::string data = "{ \"name\":";
   ASSERT_TRUE(file_util::WriteFile(messages_file, data.c_str(), data.length()));
 
   base::DictionaryValue manifest;
   manifest.SetString(keys::kDefaultLocale, "en");
   std::string error;
   EXPECT_FALSE(extension_l10n_util::ValidateExtensionLocales(
       temp.path(), &manifest, &error));
   EXPECT_THAT(error,
               testing::HasSubstr(
-                  UTF16ToUTF8(messages_file.LossyDisplayName())));
+                  base::UTF16ToUTF8(messages_file.LossyDisplayName())));
 }
 
 TEST(ExtensionL10nUtil, GetValidLocalesEmptyLocaleFolder) {
   base::ScopedTempDir temp;
   ASSERT_TRUE(temp.CreateUniqueTempDir());
 
   base::FilePath src_path = temp.path().Append(kLocaleFolder);
   ASSERT_TRUE(base::CreateDirectory(src_path));
 
   std::string error;
@@ skipping 597 matching lines @@
   std::vector<std::string> fallback_locales;
   extension_l10n_util::GetAllFallbackLocales("en_US", "all", &fallback_locales);
   ASSERT_EQ(3U, fallback_locales.size());
 
   CHECK_EQ("en_US", fallback_locales[0]);
   CHECK_EQ("en", fallback_locales[1]);
   CHECK_EQ("all", fallback_locales[2]);
 }
 
 }  // namespace