Move EXPECT_DCHECK_DEATH from base/task_scheduler and use it in relevant base/ tests

base/task_scheduler/scheduler_worker_stack_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 "base/task_scheduler/scheduler_worker_stack.h"
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/task_scheduler/scheduler_worker.h"
 #include "base/task_scheduler/sequence.h"
 #include "base/task_scheduler/task_tracker.h"
-#include "base/task_scheduler/test_utils.h"
+#include "base/test/gtest_util.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 namespace internal {
 
 namespace {
 
 class MockSchedulerWorkerDelegate : public SchedulerWorker::Delegate {
@@ skipping 222 matching lines @@
 
 // Verify that Push() DCHECKs when a value is inserted twice.
 TEST_F(TaskSchedulerWorkerStackTest, PushTwice) {
   SchedulerWorkerStack stack;
   stack.Push(worker_a_.get());
   EXPECT_DCHECK_DEATH({ stack.Push(worker_a_.get()); }, "");
 }
 
 }  // namespace internal
 }  // namespace base