Roll gn from 85944ebc24a9 to a2e2717ea670

https://gn.googlesource.com/gn.git/+log/85944ebc24a9..a2e2717ea670

Change-Id: Iace2ff12b7902368cc177047a3654bb7a697712c
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/115992
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Alan Screen <awscreen@chromium.org>
diff --git a/DEPS b/DEPS
index 6bca384..83f91f0 100644
--- a/DEPS
+++ b/DEPS
@@ -120,7 +120,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling GN CIPD package version
   # and whatever else without interference from each other.
-  'gn_version': 'git_revision:85944ebc24a90ec1e489e85a46fdc68542c3146f',
+  'gn_version': 'git_revision:a2e2717ea670249a34b0de4b3e54f268d320bdfa',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling gtest
   # and whatever else without interference from each other.