Cleanup TestExpectations.

-crbug.com/366387 [ Debug ] svg/as-object/deep-nested-embedded-svg-size-changes-no-layout-triggers-1.html [ Crash ]
-crbug.com/366387 [ Debug ] svg/as-object/deep-nested-embedded-svg-size-changes-no-layout-triggers-2.html [ Crash ]
-crbug.com/370789 fast/dom/document-contentType-data-uri.html [ Failure ]


BUG=366387, 370789
TBR=alph, esprehn
NOTRY=true

Review URL: https://codereview.chromium.org/298313002

git-svn-id: svn://svn.chromium.org/blink/trunk@174938 bbb929c8-8fbe-4397-9dbb-9b2b20218538