Elliott Sprehn 2231bc3ba9 Don't walk treescopes in updateActiveStyleSheets until the resolver exists.
The update doesn't actually do anything until the resolver
is created, just skip the tree walk.

This also removes the special case for document from StyleSheetCollection
which didn't make any sense. It would cause us to discard the entire
resolver whenever the sheets in the document changed which is far more
work than is actually needed. We probably are missing some font invalidation
code now, but we can add that back later.

R=ojan@chromium.org

Review URL: https://codereview.chromium.org/836383005
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