GN: Fix bootstrap.py

tools/gn/bootstrap/bootstrap.py

Index: tools/gn/bootstrap/bootstrap.py
diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index 3d996366f36ce052f57f2430dfe396dc5285cc59..fea931245daf5b4cfb13f2b5c2fd23e0b3779cd7 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -224,6 +224,7 @@ def write_ninja(path, root_gen_dir, options):
       'base/files/file_path_constants.cc',
       'base/files/file_tracing.cc',
       'base/files/file_util.cc',
+      'base/files/important_file_writer.cc',
       'base/files/memory_mapped_file.cc',
       'base/files/scoped_file.cc',
       'base/hash.cc',
@@ -288,7 +289,6 @@ def write_ninja(path, root_gen_dir, options):
       'base/third_party/dmg_fp/g_fmt.cc',
       'base/third_party/icu/icu_utf.cc',
       'base/third_party/nspr/prtime.cc',
-      'base/thread_task_runner_handle.cc',
       'base/threading/non_thread_safe_impl.cc',
       'base/threading/post_task_and_reply_impl.cc',
       'base/threading/sequenced_task_runner_handle.cc',
@@ -300,6 +300,7 @@ def write_ninja(path, root_gen_dir, options):
       'base/threading/thread_id_name_manager.cc',
       'base/threading/thread_local_storage.cc',
       'base/threading/thread_restrictions.cc',
+      'base/threading/thread_task_runner_handle.cc',
       'base/threading/worker_pool.cc',
       'base/time/time.cc',
       'base/timer/elapsed_timer.cc',