Remove header dependencies from sequence_checker.h to sequenced_worker_pool.h

components/memory_pressure/memory_pressure_monitor_unittest.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 "components/memory_pressure/memory_pressure_monitor.h"
 
 #include <memory>
 
 #include "base/bind.h"
+#include "base/task_runner.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "base/tracked_objects.h"
 #include "components/memory_pressure/memory_pressure_stats_collector.h"
 #include "components/memory_pressure/test_memory_pressure_calculator.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace memory_pressure {
 
 namespace {
@@ skipping 360 matching lines @@
   ExpectDispatchCritical();
   monitor_->OnMemoryPressureChanged(MEMORY_PRESSURE_LEVEL_CRITICAL);
   VerifyAndClearExpectations();
   ExpectCritical();
   EXPECT_EQ(2u, monitor_->scheduled_checks().size());
 }
 
 #endif  // !MEMORY_PRESSURE_IS_POLLING
 
 }  // namespace memory_pressure