Fix Service Worker cache storage and cache storage keys expectations.

Chromium commit
https://crrev.com/203f6295dc41e5172931661cfa106ce9a66da92e means we
now are passing more layout tests. Remove the expectations file for
failure.

TBR=zmo,asanka
BUG=None

Review URL: https://codereview.chromium.org/606823002

git-svn-id: svn://svn.chromium.org/blink/trunk@182699 bbb929c8-8fbe-4397-9dbb-9b2b20218538