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

chrome/browser/autocomplete/builtin_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 "chrome/browser/autocomplete/builtin_provider.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_input.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/autocomplete/autocomplete_provider.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
+using base::ASCIIToUTF16;
+
 class BuiltinProviderTest : public testing::Test {
  protected:
   template<class ResultType>
   struct test_data {
     const base::string16 input;
     const size_t num_results;
     const ResultType output[3];
   };
 
   BuiltinProviderTest() : builtin_provider_(NULL) {}
@@ skipping 190 matching lines @@
     {kSettings + kPage1.substr(0, 2),                   1, {kURL1}},
     {kSettings + kPage1.substr(0, kPage1.length() - 1), 1, {kURL1}},
     {kSettings + kPage1,                                1, {kURL1}},
     {kSettings + kPage2,                                1, {kURL2}},
   };
 
   RunTest<GURL>(settings_subpage_cases, arraysize(settings_subpage_cases),
                 &AutocompleteMatch::destination_url);
 }
 #endif