Revert "Re-land deferred compositing updates with fixed assumptions"

This reverts commit r161126. It caused compositing/video/video-poster.html crashes in debug mode and made inspector-protocol/layers/get-layers.html fail on Mac and Win:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20Blink&tests=compositing%2Fvideo%2Fvideo-poster.html%2Cinspector-protocol%2Flayers%2Fget-layers.html

BUG=229679, 302726, 309733
TBR=shawnsingh@chromium.org

Review URL: https://codereview.chromium.org/46163008

git-svn-id: svn://svn.chromium.org/blink/trunk@161146 bbb929c8-8fbe-4397-9dbb-9b2b20218538