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

base/task_scheduler/scheduler_worker_stack_unittest.cc

Index: base/task_scheduler/scheduler_worker_stack_unittest.cc
diff --git a/base/task_scheduler/scheduler_worker_stack_unittest.cc b/base/task_scheduler/scheduler_worker_stack_unittest.cc
index 2a77008b6466a9ab636410f3c73c20cc37085120..2bbeb2dbe7af4e4fe72c77497a259a4034b9a16c 100644
--- a/base/task_scheduler/scheduler_worker_stack_unittest.cc
+++ b/base/task_scheduler/scheduler_worker_stack_unittest.cc
@@ -10,7 +10,7 @@
 #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"