Elliott Sprehn 7fd0df2238 Remove tracking of pending sheets.
I was going to remove all this anyway since we don't need it in sky, all sheets
are local and there's no concept of a pending sheet now.

I also removed the dirty bit I added to StyleSheetCollection. The bit
is not correct and is preventing us from correctly processing sheets and
invalidating style. I'll add it back later when I understand how to add
the dirty bit correctly.

R=ojan@chromium.org

Review URL: https://codereview.chromium.org/846183002
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