TaskScheduler: Remove base::ExecutionMode.

base/task_scheduler/test_utils.h

+// 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.
+
+#ifndef BASE_TASK_SCHEDULER_TEST_UTILS_H_
+#define BASE_TASK_SCHEDULER_TEST_UTILS_H_
+
+namespace base {
+namespace internal {
+namespace test {
+
+// An enumeration of possible task scheduler TaskRunner types. Used to
+// parametrize relevant task_scheduler tests.
+enum class ExecutionMode { PARALLEL, SEQUENCED, SINGLE_THREADED };
+
+}  // namespace test
+}  // namespace internal
+}  // namespace base
+
+#endif  // BASE_TASK_SCHEDULER_TEST_UTILS_H_