Revert of DevTools: [Console] noop instead of DOM rebuilding in certain cases. (https://codereview.chromium.org/377553002/)

Reason for revert:
This breaks Ctrl-O dialog

Original issue's description:
> DevTools: [Console] noop instead of DOM rebuilding in certain cases.
> 
> This patch avoids DOM rebuilding if the set of viewported elements does
> not change.
> 
> BUG=385029
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=177656

TBR=vsevik@chromium.org,pfeldman@chromium.org,aandrey@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=385029

Review URL: https://codereview.chromium.org/373043005

git-svn-id: svn://svn.chromium.org/blink/trunk@177675 bbb929c8-8fbe-4397-9dbb-9b2b20218538