Fix GN bootstrap

TBR=brettw

Bug: none
Change-Id: I0772178c0dae3355c32c375108df6e32a30f228f
Reviewed-on: https://chromium-review.googlesource.com/530225
Reviewed-by: Paweł Hajdan Jr. <phajdan.jr@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#478520}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: e4a28698a612c3a99d802e7658960c3a09533cec

tools/gn/bootstrap/bootstrap.py

diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index e806761..dd564ac 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -410,6 +410,7 @@
       'base/debug/dump_without_crashing.cc',
       'base/debug/stack_trace.cc',
       'base/debug/task_annotator.cc',
+      'base/debug/thread_heap_usage_tracker.cc',
       'base/environment.cc',
       'base/feature_list.cc',
       'base/files/file.cc',
@@ -507,7 +508,6 @@
       'base/third_party/dmg_fp/g_fmt.cc',
       'base/third_party/icu/icu_utf.cc',
       'base/third_party/nspr/prtime.cc',
-      'base/threading/non_thread_safe_impl.cc',
       'base/threading/post_task_and_reply_impl.cc',
       'base/threading/sequenced_task_runner_handle.cc',
       'base/threading/sequenced_worker_pool.cc',