Revert r170660 Enable Repaint After Layout.

The repaint-after-layout code has triggered several issues which need to be
resolved before it can be re-enabled.

This includes:
 - crbug.com/359669: 7%-8% regression in robohornet_pro
 - crbug.com/359826: Incorrect rendering of chat moles in Gmail
 - crbug.com/360019: chrome://apps icon incorrect invalidation on drag

BUG=320139, 359602, 359826, 359669, 360019

Review URL: https://codereview.chromium.org/226103002

git-svn-id: svn://svn.chromium.org/blink/trunk@170885 bbb929c8-8fbe-4397-9dbb-9b2b20218538