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

base/threading/simple_thread_unittest.cc

 // 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/atomic_sequence_num.h"
 #include "base/string_number_conversions.h"
 #include "base/threading/simple_thread.h"
-#include "base/waitable_event.h"
+#include "base/synchronization/waitable_event.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 namespace {
 
 class SetIntRunner : public DelegateSimpleThread::Delegate {
  public:
   SetIntRunner(int* ptr, int val) : ptr_(ptr), val_(val) { }
   ~SetIntRunner() { }
@@ skipping 142 matching lines @@
   VerifyPoolRunner verifier(&seq2, 9, &event);
   pool.Start();
 
   pool.AddWork(&verifier, 10);
 
   pool.JoinAll();
   EXPECT_EQ(seq2.GetNext(), 10);
 }
 
 }  // namespace base