Use Dequeue::removeLast() in StyleResolver::addToStyleSharingList()
Use Dequeue::removeLast() in StyleResolver::addToStyleSharingList()

Use Dequeue::removeLast() in StyleResolver::addToStyleSharingList() instead of
Dequeue::remove(--end()) to remove the last element in the Dequeue. This
increases the code readability a bit and removeLast() implementation is a bit
simpler.

R=esprehn@chromium.org

Review URL: https://codereview.chromium.org/395933002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@178200 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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