DevTools: NetworkPanel: "waiting" bar shouldn't span over whole request.

BUG=

Review URL: https://codereview.chromium.org/508033002

git-svn-id: svn://svn.chromium.org/blink/trunk@180965 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Remove old workers code

BUG=

Review URL: https://codereview.chromium.org/510743002

git-svn-id: svn://svn.chromium.org/blink/trunk@180966 bbb929c8-8fbe-4397-9dbb-9b2b20218538