Revert "Fix a corpus test failure introduced by commit 84f6a56"

This reverts commit b87e5f8a4ca98b5a7b12b1d3e6508fe9faad33c3.

BUG=pdfium:336
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1557713004 .
diff --git a/fx/other/group_xobject_expected.pdf.0.png b/fx/other/group_xobject_expected.pdf.0.png
index 1676452..6c7835c 100644
--- a/fx/other/group_xobject_expected.pdf.0.png
+++ b/fx/other/group_xobject_expected.pdf.0.png
Binary files differ