Regression (r183698): Focus gets lost after pressing tab key for Interactive Circles canvas experiment.

Lineboxes don't currently get their overflow recalculated outside the layout path if they 
are tied to inline renderers. The compute-overflow-without-layout path for inline is intricate
enough to be of dubious merit so for now just reinstate the layout.

BUG=424078

Review URL: https://codereview.chromium.org/662163003

git-svn-id: svn://svn.chromium.org/blink/trunk@184110 bbb929c8-8fbe-4397-9dbb-9b2b20218538