[chromium] Rebaseline and enable the background-blur layout tests
https://bugs.webkit.org/show_bug.cgi?id=84654
Unreviewed.
* platform/chromium-linux/platform/chromium/compositing/filters/background-filter-blur-outsets-expected.txt: Removed.
* platform/chromium-mac/platform/chromium/compositing/filters/background-filter-blur-outsets-expected.png: Added.
* platform/chromium-win/platform/chromium/compositing/filters/background-filter-blur-outsets-expected.png:
* platform/chromium/test_expectations.txt:
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@115106
268f45cc-cd09-0410-ab3c-
d52691b4dbfc