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

base/i18n/number_formatting_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 <limits>
 
 #include "base/i18n/number_formatting.h"
 #include "base/i18n/rtl.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 namespace {
 
 TEST(NumberFormattingTest, FormatNumber) {
   static const struct {
     int64 number;
     const char* expected_english;
     const char* expected_german;
@@ skipping 59 matching lines @@
               UTF16ToUTF8(FormatDouble(cases[i].number, cases[i].frac_digits)));
     i18n::SetICUDefaultLocale("de");
     testing::ResetFormatters();
     EXPECT_EQ(cases[i].expected_german,
               UTF16ToUTF8(FormatDouble(cases[i].number, cases[i].frac_digits)));
   }
 }
 
 }  // namespace
 }  // namespace base