Rebaseline svg/custom/pending-resource-after-removal.xhtml

Auto-rebaseline r179870 for r179857 appears to have failed with respect to Mac10.8.

TBR=wangxianzhu@chromium.org
BUG=

Review URL: https://codereview.chromium.org/461583002

git-svn-id: svn://svn.chromium.org/blink/trunk@179940 bbb929c8-8fbe-4397-9dbb-9b2b20218538