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

ios/chrome/browser/ui/file_locations_unittest.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/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 extern std::string GetLocalizedFileName(const std::string& base_name,
                                         const std::string& locale,
                                         const std::string& ext);
 
 extern std::string GetIOSLocaleMapping(const std::string& locale);
 
 namespace {
 
 class FileLocationsTest : public PlatformTest {
  protected:
@@ skipping 59 matching lines @@
         extension_);
     if (filename == enFile_ && ![language isEqualToString:@"en"]) {
       NSLog(@"OK: Locale %@ using language %@ falls back to use English ToS",
             locale, language);
       EXPECT_FALSE([localizedTermsHtml containsObject:language]);
     }
   }
 }
 
 }  // namespace