Remove force-update when visual rects change.

This code was added in https://codereview.chromium.org/1368163002, but
subsequently https://codereview.chromium.org/2668823002 landed, which
does the same thing and in a more targeted way.

BUG=490725,692614
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

patch from issue 2706553002 at patchset 1 (http://crrev.com/2706553002#ps1)

Review-Url: https://codereview.chromium.org/2702883002
Cr-Commit-Position: refs/heads/master@{#453808}
5 files changed