Unsuppress quick_start_guide.pdf for Skia

Drops Skia suppression for quick_start_guide.pdf.

Fixed: pdfium:1960
Change-Id: I43968173ae35085b84214328266e113e2a1e3202
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/103851
Reviewed-by: Nigi <nigi@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>
diff --git a/DEPS b/DEPS
index 30b74e1..e66ab93 100644
--- a/DEPS
+++ b/DEPS
@@ -140,7 +140,7 @@
   # 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': 'abb87a035235c2322267e13a138498c2ad1e85fd',
+  'pdfium_tests_revision': '4d6dd6a870949fcca68fc689f12a8d093f55ab74',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling resultdb
   # and whatever else without interference from each other.
diff --git a/testing/SUPPRESSIONS b/testing/SUPPRESSIONS
index c5c94b8..0746c48 100644
--- a/testing/SUPPRESSIONS
+++ b/testing/SUPPRESSIONS
@@ -297,10 +297,6 @@
 path_9.pdf mac * * *
 percentage.pdf mac * * *
 push_button.pdf * * * *
-
-# TODO(pdfium:1960): Remove after associated bug is fixed
-quick_start_guide.pdf * * * skia
-
 quick_start_guide.pdf mac * * *
 radio_button.pdf * * * *
 run_custom_validate_script.pdf * * * *