Move base to DEPS

base/callback_helpers.h

-// 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.
-
-// This defines helpful methods for dealing with Callbacks.  Because Callbacks
-// are implemented using templates, with a class per callback signature, adding
-// methods to Callback<> itself is unattractive (lots of extra code gets
-// generated).  Instead, consider adding methods here.
-//
-// ResetAndReturn(&cb) is like cb.Reset() but allows executing a callback (via a
-// copy) after the original callback is Reset().  This can be handy if Run()
-// reads/writes the variable holding the Callback.
-
-#ifndef BASE_CALLBACK_HELPERS_H_
-#define BASE_CALLBACK_HELPERS_H_
-
-#include "base/basictypes.h"
-#include "base/callback.h"
-#include "base/compiler_specific.h"
-
-namespace base {
-
-template <typename Sig>
-base::Callback<Sig> ResetAndReturn(base::Callback<Sig>* cb) {
-  base::Callback<Sig> ret(*cb);
-  cb->Reset();
-  return ret;
-}
-
-// ScopedClosureRunner is akin to scoped_ptr for Closures. It ensures that the
-// Closure is executed and deleted no matter how the current scope exits.
-class BASE_EXPORT ScopedClosureRunner {
- public:
-  ScopedClosureRunner();
-  explicit ScopedClosureRunner(const Closure& closure);
-  ~ScopedClosureRunner();
-
-  void Reset();
-  void Reset(const Closure& closure);
-  Closure Release() WARN_UNUSED_RESULT;
-
- private:
-  Closure closure_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedClosureRunner);
-};
-
-}  // namespace base
-
-#endif  // BASE_CALLBACK_HELPERS_H_