Rename CancellationFlag to AtomicFlag.

base/synchronization/atomic_flag.cc

 // Copyright (c) 2011 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/synchronization/cancellation_flag.h"
+#include "base/synchronization/atomic_flag.h"
 
 #include "base/logging.h"
 
 namespace base {
 
-void CancellationFlag::Set() {
-#if !defined(NDEBUG)
-  DCHECK_EQ(set_on_, PlatformThread::CurrentId());
-#endif
+AtomicFlag::AtomicFlag() = default;
+
+void AtomicFlag::Set() {
+  DCHECK(thread_checker_.CalledOnValidThread());
   base::subtle::Release_Store(&flag_, 1);
 }
 
-bool CancellationFlag::IsSet() const {
+bool AtomicFlag::IsSet() const {
   return base::subtle::Acquire_Load(&flag_) != 0;
 }
 
-void CancellationFlag::UnsafeResetForTesting() {
+void AtomicFlag::UnsafeResetForTesting() {
   base::subtle::Release_Store(&flag_, 0);
 }
 
 }  // namespace base