gn: fix bootstrap script

Review-Url: https://codereview.chromium.org/2446643002
Cr-Original-Commit-Position: refs/heads/master@{#427094}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 03c1d5ac093a45294eb59714db7f158de4631f54
diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index d66da12..6059741 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -450,7 +450,6 @@
       'base/task_scheduler/post_task.cc',
       'base/task_scheduler/priority_queue.cc',
       'base/task_scheduler/scheduler_lock_impl.cc',
-      'base/task_scheduler/scheduler_service_thread.cc',
       'base/task_scheduler/scheduler_worker.cc',
       'base/task_scheduler/scheduler_worker_pool_impl.cc',
       'base/task_scheduler/scheduler_worker_stack.cc',