Address regression bug report, revert the PaintInfo rect member function 
in r156859.

BUG=281490

Review URL: https://chromiumcodereview.appspot.com/23509003

git-svn-id: svn://svn.chromium.org/blink/trunk@156938 bbb929c8-8fbe-4397-9dbb-9b2b20218538