Move base to DEPS

base/ios/ns_error_util.h

-// Copyright 2015 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.
-
-#ifndef BASE_IOS_NS_ERROR_UTIL_H_
-#define BASE_IOS_NS_ERROR_UTIL_H_
-
-@class NSError;
-
-namespace base {
-namespace ios {
-
-// Iterates through |error|'s underlying errors and returns the first error for
-// which there is no underlying error.
-NSError* GetFinalUnderlyingErrorFromError(NSError* error);
-
-// Returns a copy of |original_error| with |underlying_error| appended to the
-// end of its underlying error chain.
-NSError* ErrorWithAppendedUnderlyingError(NSError* original_error,
-                                          NSError* underlying_error);
-
-}  // namespace ios
-}  // namespace base
-
-#endif  // BASE_IOS_NS_ERROR_UTIL_H_