Some XP round border tests failing after r189363
Some XP round border tests failing after r189363

Mark these tests failing on XP. Issue 453957 should examine and rebaseline
as needed after examining the round border antialias test changes.

ietestcenter/css3/bordersbackgrounds/border-radius-not-inherited-001.htm
ietestcenter/css3/bordersbackgrounds/border-radius-sum-of-radii-001.htm
ietestcenter/css3/bordersbackgrounds/border-radius-sum-of-radii-002.htm
virtual/slimmingpaint/fast/borders/border-radius-constraints.html
virtual/slimmingpaint/fast/borders/border-radius-mask-canvas-border.html
virtual/slimmingpaint/fast/borders/border-radius-with-box-shadow.html
virtual/slimmingpaint/fast/borders/mixed-border-styles-radius.html
virtual/slimmingpaint/fast/css/background-clip-radius-values.html
paint/roundedrects/circle-with-shadow.html

TBR=chrishtr@chromium.org
BUG=453957
NOTRY=true

Review URL: https://codereview.chromium.org/896723002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@189384 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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