base: Remove a copy of and copy ctor from SequenceAndSortKey.

base/task_scheduler/priority_queue.cc

 // Copyright 2016 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 "base/task_scheduler/priority_queue.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 
 namespace base {
 namespace internal {
 
 PriorityQueue::SequenceAndSortKey::SequenceAndSortKey()
     : sort_key(TaskPriority::LOWEST, TimeTicks()) {}
 
 PriorityQueue::SequenceAndSortKey::SequenceAndSortKey(
     scoped_refptr<Sequence> sequence,
     const SequenceSortKey& sort_key)
     : sequence(std::move(sequence)), sort_key(sort_key) {}
 
-PriorityQueue::SequenceAndSortKey::SequenceAndSortKey(
-    const SequenceAndSortKey& other) = default;
-
 PriorityQueue::SequenceAndSortKey::~SequenceAndSortKey() = default;
 
 PriorityQueue::Transaction::Transaction(PriorityQueue* outer_queue)
     : auto_lock_(outer_queue->container_lock_), outer_queue_(outer_queue) {
   DCHECK(CalledOnValidThread());
 }
 
 PriorityQueue::Transaction::~Transaction() {
   DCHECK(CalledOnValidThread());
 }
@@ skipping 32 matching lines @@
 }
 
 PriorityQueue::~PriorityQueue() = default;
 
 std::unique_ptr<PriorityQueue::Transaction> PriorityQueue::BeginTransaction() {
   return WrapUnique(new Transaction(this));
 }
 
 }  // namespace internal
 }  // namespace base