Roll corpus tests again

Picks up https://pdfium-review.googlesource.com/c/pdfium_tests/+/139030

Bug: 42271957
Change-Id: I68f7d9c771aa42542c9fb81578009f27fdae39c2
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/139050
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nico Weber <thakis@google.com>
Commit-Queue: Nico Weber <thakis@chromium.org>
diff --git a/DEPS b/DEPS
index 887e2e8..7e3e053 100644
--- a/DEPS
+++ b/DEPS
@@ -197,7 +197,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling pdfium_tests
   # and whatever else without interference from each other.
-  'pdfium_tests_revision': 'fc9585fb46b615ad70e7ed59529941ceb31c3e94',
+  'pdfium_tests_revision': 'c851e3dd320446e4e9b97c65edd8a0eed4ecb55f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling result_adapter_revision
   # and whatever else without interference from each other.