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

base/i18n/icu_string_conversions.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/i18n/icu_string_conversions.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_util.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "third_party/icu/public/common/unicode/ucnv.h"
 #include "third_party/icu/public/common/unicode/ucnv_cb.h"
 #include "third_party/icu/public/common/unicode/ucnv_err.h"
 #include "third_party/icu/public/common/unicode/unorm.h"
 #include "third_party/icu/public/common/unicode/ustring.h"
 
 namespace base {
 
 namespace {
 // ToUnicodeCallbackSubstitute() is based on UCNV_TO_U_CALLBACK_SUBSTITUTE
@@ skipping 259 matching lines @@
       buffer.get(), static_cast<int>(max_length), &status);
   if (!U_SUCCESS(status))
     return false;
   normalized_utf16.assign(buffer.get(), actual_length);
 
   return UTF16ToUTF8(normalized_utf16.data(),
                      normalized_utf16.length(), result);
 }
 
 }  // namespace base