Move CancellationFlag and WaitableEvent to the synchronization subdirectory....

base/cancellation_flag.cc

Index: base/cancellation_flag.cc
===================================================================
--- base/cancellation_flag.cc	(revision 70364)
+++ base/cancellation_flag.cc	(working copy)
@@ -1,22 +0,0 @@
-// Copyright (c) 2010 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/cancellation_flag.h"
-
-#include "base/logging.h"
-
-namespace base {
-
-void CancellationFlag::Set() {
-#if !defined(NDEBUG)
-  DCHECK_EQ(set_on_, PlatformThread::CurrentId());
-#endif
-  base::subtle::Release_Store(&flag_, 1);
-}
-
-bool CancellationFlag::IsSet() const {
-  return base::subtle::Acquire_Load(&flag_) != 0;
-}
-
-}  // namespace base