Move Document::m_inStyleRecalc into DocumentLifecycle

This CL removes the m_inStyleRecalc bool from Document and adds that
information to the DocumentLifecycle state machine. We eventually want to move
style recalc, layout, compositing update, and paiting into the state machine.

BUG=282720
R=eseidel@chromium.org, vollick@chromium.org

Review URL: https://codereview.chromium.org/150423004

git-svn-id: svn://svn.chromium.org/blink/trunk@166187 bbb929c8-8fbe-4397-9dbb-9b2b20218538