Revert "Track intruding and overhanging floats"

This reverts commit 2cd349dd1d8b63ecb677af46c762ef765295c3f6.

This commit resulted in a 2% performance regression.

Conflicts:
	LayoutTests/TestExpectations

BUG=334759
TBR=bemjb@chromium.org

Review URL: https://codereview.chromium.org/141953002

git-svn-id: svn://svn.chromium.org/blink/trunk@165338 bbb929c8-8fbe-4397-9dbb-9b2b20218538