Use a direct include of utf_string_conversions.h in android_webview/, apps/, ash/, base/.

base/i18n/string_search_unittest.cc

 // Copyright (c) 2011 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 <string>
 
 #include "base/i18n/rtl.h"
 #include "base/i18n/string_search.h"
 #include "base/string16.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/icu/public/i18n/unicode/usearch.h"
 
 namespace base {
 namespace i18n {
 
 // Note on setting default locale for testing: The current default locale on
 // the Mac trybot is en_US_POSIX, with which primary-level collation strength
 // string search is case-sensitive, when normally it should be
 // case-insensitive. In other locales (including en_US which English speakers
@@ skipping 173 matching lines @@
   SetICUDefaultLocale("da");
 
   EXPECT_FALSE(StringSearchIgnoringCaseAndAccents(
       a_base, a_with_ring, NULL, NULL));
 
   SetICUDefaultLocale(default_locale);
 }
 
 }  // namespace i18n
 }  // namespace base