Remove parts of //cc we aren't using

cc/base/delayed_unique_notifier.cc

-// 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.
-
-#include "cc/base/delayed_unique_notifier.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/location.h"
-#include "base/sequenced_task_runner.h"
-
-namespace cc {
-
-DelayedUniqueNotifier::DelayedUniqueNotifier(
-    base::SequencedTaskRunner* task_runner,
-    const base::Closure& closure,
-    const base::TimeDelta& delay)
-    : task_runner_(task_runner),
-      closure_(closure),
-      delay_(delay),
-      notification_pending_(false),
-      weak_ptr_factory_(this) {
-}
-
-DelayedUniqueNotifier::~DelayedUniqueNotifier() {
-}
-
-void DelayedUniqueNotifier::Schedule() {
-  if (notification_pending_) {
-    next_notification_time_ = Now() + delay_;
-    return;
-  }
-
-  next_notification_time_ = Now() + delay_;
-  task_runner_->PostDelayedTask(FROM_HERE,
-                                base::Bind(&DelayedUniqueNotifier::NotifyIfTime,
-                                           weak_ptr_factory_.GetWeakPtr()),
-                                delay_);
-  notification_pending_ = true;
-}
-
-void DelayedUniqueNotifier::Cancel() {
-  next_notification_time_ = base::TimeTicks();
-}
-
-void DelayedUniqueNotifier::Shutdown() {
-  // This function must destroy any weak ptrs since after being cancelled, this
-  // class may be destroyed on another thread during compositor shutdown.
-  weak_ptr_factory_.InvalidateWeakPtrs();
-  // Deliberately leaves notification_pending_ = true forever so new tasks with
-  // weak ptrs can not be created.
-  notification_pending_ = true;
-}
-
-bool DelayedUniqueNotifier::HasPendingNotification() const {
-  return notification_pending_ && !next_notification_time_.is_null();
-}
-
-base::TimeTicks DelayedUniqueNotifier::Now() const {
-  return base::TimeTicks::Now();
-}
-
-void DelayedUniqueNotifier::NotifyIfTime() {
-  // If next notifiaction time is not valid, then this schedule was canceled.
-  if (next_notification_time_.is_null()) {
-    notification_pending_ = false;
-    return;
-  }
-
-  // If the notification was rescheduled or arrived too early for any other
-  // reason, then post another task instead of running the callback.
-  base::TimeTicks now = Now();
-  if (next_notification_time_ > now) {
-    task_runner_->PostDelayedTask(
-        FROM_HERE,
-        base::Bind(&DelayedUniqueNotifier::NotifyIfTime,
-                   weak_ptr_factory_.GetWeakPtr()),
-        next_notification_time_ - now);
-    return;
-  }
-
-  // Note the order here is important since closure might schedule another run.
-  notification_pending_ = false;
-  closure_.Run();
-}
-
-}  // namespace cc