ServiceWorker: Promise rejections should be DOMExceptions, not DOMErrors

BUG=365886

Review URL: https://codereview.chromium.org/246543003

git-svn-id: svn://svn.chromium.org/blink/trunk@172658 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Get the WebUserMediaClient from WebFrameClient instead of WebViewClient.

BUG=304341

Review URL: https://codereview.chromium.org/254523006

git-svn-id: svn://svn.chromium.org/blink/trunk@172659 bbb929c8-8fbe-4397-9dbb-9b2b20218538