Remove FlowThreadController and relateds.
There's no need for FlowThreadController,
CurrentRenderFlowThreadMaintainer or CurrentRenderFlowThreadDisabler.
Store the current flow thread in LayoutState instead, so that
RenderObject::locateFlowThreadContainingBlock() can still find the
flow thread quickly during layout.
Also removed CSS regions relic from collapseAnonymousBlockChild().
R=jchaffraix@chromium.org
Review URL: https://codereview.chromium.org/769093002
git-svn-id: svn://svn.chromium.org/blink/trunk@186328 bbb929c8-8fbe-4397-9dbb-9b2b20218538
13 files changed
