This was used to skip caching sheets across documents that had failed
resource loads so that when you loaded a new tab with the same resource
we'd attempt to load it again.
The cross document cache (which was only used by <link>) doesn't exist
in Sky, and neither does CSSStyleSheetResource which used it, so we can
remove all this code.
R=ojan@chromium.org
Review URL: https://codereview.chromium.org/799113003
This caused us to lose our gn check certification. :(
Turns out gn check was just ignoring all the header
paths it didn't understand and so gn check passing
for sky wasn't meaning much. I tried to straighten
out some of the mess in this CL, but its going to take
several more rounds of massaging before gn check
passes again. On the bright side (almost) all of
our headers are absolute now. Turns out my script
(attached to the bug) didn't notice ../ includes
but I'll fix that in the next patch.
R=abarth@chromium.org
BUG=435361
Review URL: https://codereview.chromium.org/746023002
