Revert "StyleResolverParentPusher can decide if it needs to push at creation time"

This commit reverts http://src.chromium.org/viewvc/blink?view=revision&revision=161770

Previously we'd never push the bloom filter for Elements that contained only
Text nodes, but r161770 made us start doing that. Apparently the bloom filter
updating is expensive: 8-10% more than just regular text style updating since
text doesn't need to selector match and the bloom filter is just wasted work.

BUG=318660
TBR=leviw@chromium.org

Review URL: https://codereview.chromium.org/59883011

git-svn-id: svn://svn.chromium.org/blink/trunk@161943 bbb929c8-8fbe-4397-9dbb-9b2b20218538