[ObjC ARC] Converts ios/chrome/browser/ui:ui to ARC.

ios/chrome/browser/ui/file_locations.mm

 // Copyright 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 "ios/chrome/browser/ui/file_locations.h"
 
 #include "base/mac/bundle_locations.h"
 #include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ios/chrome/browser/application_context.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 // English is the default locale for the Terms of Service.
 const char kEnglishLocale[] = "en";
 // The prefix of the Chrome Terms of Service file name.
 const char kChromeTosFilePrefix[] = "terms";
 // The file name extension for HTML files.
 const char kHtmlFileExtension[] = "html";
 
 // Checks that the requested file exists in the application's resource
 // bundle and returns the filename. Returns an empty string if resource does not
@@ skipping 56 matching lines @@
     resource_file = FindFileInResource(base_name, kEnglishLocale, ext);
   }
   DCHECK(!resource_file.empty());
   return resource_file;
 }
 
 std::string GetTermsOfServicePath() {
   const std::string& locale = GetApplicationContext()->GetApplicationLocale();
   return GetLocalizedFileName(kChromeTosFilePrefix, locale, kHtmlFileExtension);
 }