Removed TestExpectations comments after rebaseline
Removed TestExpectations comments after rebaseline

image-set related flaky Windows tests were commented on TestExpectations, since they needed rebaselining.
Once rebaselined, I've uncommented these tests in TestExpectations.

BUG=299556

Review URL: https://codereview.chromium.org/29163004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@159991 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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