Fix four dangling header-file references in .gyp files

components/scheduler/scheduler.gypi

 # Copyright 2015 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.
 
 {
   'variables': {
     'scheduler_sources': [
       'base/cancelable_closure_holder.cc',
       'base/cancelable_closure_holder.h',
       'base/lazy_now.cc',
       'base/lazy_now.h',
+      'base/nestable_single_thread_task_runner.h',
       'base/task_queue.cc',
       'base/task_queue.h',
       'base/task_queue_impl.cc',
       'base/task_queue_impl.h',
       'base/task_queue_manager.cc',
       'base/task_queue_manager.h',
       'base/task_queue_selector.cc',
       'base/task_queue_selector.h',
       'base/task_queue_sets.cc',
       'base/task_queue_sets.h',
       'base/pollable_thread_safe_flag.cc',
       'base/pollable_thread_safe_flag.h',
       'child/child_scheduler.h',
       'child/idle_helper.cc',
       'child/idle_helper.h',
-      'child/nestable_single_thread_task_runner.h',
       'child/scheduler_helper.cc',
       'child/scheduler_helper.h',
       'child/scheduler_task_runner_delegate.h',
       'child/scheduler_task_runner_delegate_impl.cc',
       'child/scheduler_task_runner_delegate_impl.h',
       'child/single_thread_idle_task_runner.cc',
       'child/single_thread_idle_task_runner.h',
       'child/web_scheduler_impl.cc',
       'child/web_scheduler_impl.h',
       'child/web_task_runner_impl.cc',
@@ skipping 27 matching lines @@
       'renderer/webthread_impl_for_renderer_scheduler.cc',
       'renderer/webthread_impl_for_renderer_scheduler.h',
       'scheduler_export.h',
     ],
     'scheduler_test_support_sources': [
       'test/lazy_scheduler_message_loop_delegate_for_tests.cc',
       'test/lazy_scheduler_message_loop_delegate_for_tests.h',
     ],
   },
 }