Add fpdfsdk/{pwl,formfiller,fpdfxfa}/ directories to unsafe buffers.

The code is already clean with respect to UNSAFE_BUFFERS.

Change-Id: I0076c7ec9210e16cc186119bb4a8f27bd68098f7
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/117815
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Thomas Sepez <tsepez@google.com>
diff --git a/pdfium_unsafe_buffers_paths.txt b/pdfium_unsafe_buffers_paths.txt
index 60b168f..8f0506b 100644
--- a/pdfium_unsafe_buffers_paths.txt
+++ b/pdfium_unsafe_buffers_paths.txt
@@ -17,3 +17,6 @@
 # See `docs/unsafe_buffers.md`.
 
 core/fxcrt/
+fpdfsdk/formfiller/
+fpdfsdk/pwl/
+fpdfsdk/fpdfxfa/