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

chrome/browser/autocomplete/keyword_provider_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/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/autocomplete/keyword_provider.h"
 #include "chrome/browser/search_engines/template_url.h"
 #include "chrome/browser/search_engines/template_url_service.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
+using base::ASCIIToUTF16;
+
 class KeywordProviderTest : public testing::Test {
  protected:
   template<class ResultType>
   struct MatchType {
     const ResultType member;
     bool allowed_to_be_default_match;
   };
 
   template<class ResultType>
   struct TestData {
@@ skipping 318 matching lines @@
   TestData<GURL> url_cases[] = {
     { ASCIIToUTF16("a 1 2 3"), 3,
       { { GURL("aa.com?a=b&foo=1+2+3"), false },
         { GURL("bogus URL 1+2+3"), false },
         { GURL("http://aaaa/?aaaa=1&b=1+2+3&c"), false } } },
   };
 
   RunTest<GURL>(url_cases, arraysize(url_cases),
                 &AutocompleteMatch::destination_url);
 }