fast/block/float/015.html uses wrong urls for resources

Fix the urls used in the testcase and mark the TextExpectations to rebaseline non linux platforms.

BUG=410491

Review URL: https://codereview.chromium.org/535363002

git-svn-id: svn://svn.chromium.org/blink/trunk@181419 bbb929c8-8fbe-4397-9dbb-9b2b20218538