Remove SequencedWorkerPool::PostDelayedWorkerTask().

base/threading/sequenced_worker_pool.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.
 
 #ifndef BASE_THREADING_SEQUENCED_WORKER_POOL_H_
 #define BASE_THREADING_SEQUENCED_WORKER_POOL_H_
 
 #include <stddef.h>
 
 #include <cstddef>
@@ skipping 260 matching lines @@
   // assumptions of the running task.
   //
   // The task will be guaranteed to run to completion before shutdown
   // (BLOCK_SHUTDOWN semantics).
   //
   // Returns true if the task was posted successfully. This may fail during
   // shutdown regardless of the specified ShutdownBehavior.
   bool PostWorkerTask(const tracked_objects::Location& from_here,
                       OnceClosure task);
 
-  // Same as PostWorkerTask but allows a delay to be specified (although doing
-  // so changes the shutdown behavior). The task will be run after the given
-  // delay has elapsed.
-  //
-  // If the delay is nonzero, the task won't be guaranteed to run to completion
-  // before shutdown (SKIP_ON_SHUTDOWN semantics) to avoid shutdown hangs.
-  // If the delay is zero, this behaves exactly like PostWorkerTask, i.e. the
-  // task will be guaranteed to run to completion before shutdown
-  // (BLOCK_SHUTDOWN semantics).
-  bool PostDelayedWorkerTask(const tracked_objects::Location& from_here,
-                             OnceClosure task,
-                             TimeDelta delay);
-
   // Same as PostWorkerTask but allows specification of the shutdown behavior.
   bool PostWorkerTaskWithShutdownBehavior(
       const tracked_objects::Location& from_here,
       OnceClosure task,
       WorkerShutdown shutdown_behavior);
 
   // Like PostWorkerTask above, but provides sequencing semantics. This means
   // that tasks posted with the same sequence token (see GetSequenceToken())
   // are guaranteed to execute in order. This is useful in cases where you're
   // doing operations that may depend on previous ones, like appending to a
@@ skipping 105 matching lines @@
   // Avoid pulling in too many headers by putting (almost) everything
   // into |inner_|.
   const std::unique_ptr<Inner> inner_;
 
   DISALLOW_COPY_AND_ASSIGN(SequencedWorkerPool);
 };
 
 }  // namespace base
 
 #endif  // BASE_THREADING_SEQUENCED_WORKER_POOL_H_