Revert of scheduler: Add a base directory

components/scheduler/child/cancelable_closure_holder.h

+// Copyright 2014 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 COMPONENTS_SCHEDULER_CHILD_CANCELABLE_CLOSURE_HOLDER_H_
+#define COMPONENTS_SCHEDULER_CHILD_CANCELABLE_CLOSURE_HOLDER_H_
+
+#include "base/cancelable_callback.h"
+
+namespace scheduler {
+
+// A CancelableClosureHolder is a CancelableCallback which resets its wrapped
+// callback with a cached closure whenever it is canceled.
+class CancelableClosureHolder {
+ public:
+  CancelableClosureHolder();
+  ~CancelableClosureHolder();
+
+  // Resets the closure to be wrapped by the cancelable callback.  Cancels any
+  // outstanding callbacks.
+  void Reset(const base::Closure& callback);
+
+  // Cancels any outstanding closures returned by callback().
+  void Cancel();
+
+  // Returns a callback that will be disabled by calling Cancel(). Callback
+  // must have been set using Reset() before calling this function.
+  const base::Closure& callback() const;
+
+ private:
+  base::Closure callback_;
+  base::CancelableClosure cancelable_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(CancelableClosureHolder);
+};
+
+}  // namespace scheduler
+
+#endif  // COMPONENTS_SCHEDULER_CHILD_CANCELABLE_CLOSURE_HOLDER_H_