Roll PDFium from 6574dd27f4ce to 6de4055e8bdf (3 revisions)

https://pdfium.googlesource.com/pdfium.git/+log/6574dd27f4ce..6de4055e8bdf

2024-12-12 tsepez@chromium.org Add trailing slash in pdfium_unsafe_buffers_paths.txt.
2024-12-12 tsepez@chromium.org Wrap libc calls with UNSAFE_BUFFERS() in fx_memcpy_wrappers.h.
2024-12-12 andyphan@chromium.org [AGG] Support negative dash phases

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/pdfium-autoroll
Please CC dhoss@chromium.org,thestig@chromium.org,thestig@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in PDFium: https://bugs.chromium.org/p/pdfium/issues/entry
To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Bug: chromium:370546365,chromium:40491355
Tbr: thestig@google.com
Change-Id: I83d163b94a9370242ca18c24feadd358235c46ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6093499
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1396081}

DEPS

@@ -296,7 +296,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.
-  'pdfium_revision': '6574dd27f4ce8b61d197cd20b7a6a1c9874731b0',
+  'pdfium_revision': '6de4055e8bdf892e364324fc23e80f54d66c76f8',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.