Revert "FastTextAutosizing: apply inflation to parent RenderBlock."

This reverts https://src.chromium.org/viewvc/blink?revision=163677&view=revision

It's suspected of causing crashes on the ASAN bot.

BUG=328124
TBR=pdr@chromium.org,junov@chromium.org

Review URL: https://codereview.chromium.org/103383005

git-svn-id: svn://svn.chromium.org/blink/trunk@163815 bbb929c8-8fbe-4397-9dbb-9b2b20218538