Revert 160091 "DevTools: handle toolbar resize on screencast res..."

> DevTools: handle toolbar resize on screencast resize.
> 
> R=vsevik@chromium.org
> 
> Review URL: https://codereview.chromium.org/32633002

TBR=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/29423004

git-svn-id: svn://svn.chromium.org/blink/trunk@160103 bbb929c8-8fbe-4397-9dbb-9b2b20218538