DevTools: Do not restore closeable views in drawer upon inspector opening.

Otherwise we end up with an empty console view if editor tab was open in drawer when inspector was closed.

R=pfeldman

Review URL: https://codereview.chromium.org/110063002

git-svn-id: svn://svn.chromium.org/blink/trunk@163422 bbb929c8-8fbe-4397-9dbb-9b2b20218538