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

chrome/browser/search_engines/template_url_prepopulate_data_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/command_line.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_vector.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/search_engines/prepopulated_engines.h"
 #include "chrome/browser/search_engines/search_terms_data.h"
 #include "chrome/browser/search_engines/template_url.h"
 #include "chrome/browser/search_engines/template_url_prepopulate_data.h"
 #include "chrome/browser/search_engines/template_url_service.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_pref_service_syncable.h"
 #include "chrome/test/base/testing_profile.h"
 #include "grit/generated_resources.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/l10n/l10n_util.h"
 
+using base::ASCIIToUTF16;
+
 namespace {
 SearchEngineType GetEngineType(const std::string& url) {
   TemplateURLData data;
   data.SetURL(url);
   return TemplateURLPrepopulateData::GetEngineType(TemplateURL(NULL, data));
 }
 }  // namespace
 
 typedef testing::Test TemplateURLPrepopulateDataTest;
 
@@ skipping 328 matching lines @@
 
 TEST(TemplateURLPrepopulateDataTest, GetLogoURLInvalid) {
   TemplateURLData data;
   data.SetURL("http://invalid:search:url/");
   TemplateURL turl(NULL, data);
   GURL logo_url = TemplateURLPrepopulateData::GetLogoURL(
       turl, TemplateURLPrepopulateData::LOGO_100_PERCENT);
 
   EXPECT_TRUE(logo_url.is_empty());
 }