Remove unused param from PDM

Also, added IN-TEST comment for testing methods

Bug: b/329734571
Change-Id: I5ac27cc4a0f3640f1cf1fb4bfb3dda5612d8d901
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5404356


Reviewed-by: Florian Leimgruber <fleimgruber@google.com>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Siddharth Shah <siashah@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1279910}