Mark fast/transforms/shadows.html as needing rebaseline.
Mark fast/transforms/shadows.html as needing rebaseline.

These have been failing with image diffs on Mac and XP for ages, maybe
since r186337. On Mac10.6 the current results look like a definite
*pro*gression (shapes are filled in and look like other platforms); on
other Mac and XP the diffs look like innocuous differences in how some
shadows blur.

BUG=381919
TBR=enne@chromium.org

Review URL: https://codereview.chromium.org/751063004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@186680 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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