Mark inspector/console/ flaky tests as Release only.

They seem to happen only on release. It might allow some coverage.

BUG=406283
TBR=lushnikov@chromium.org

Review URL: https://codereview.chromium.org/508913002

git-svn-id: svn://svn.chromium.org/blink/trunk@180968 bbb929c8-8fbe-4397-9dbb-9b2b20218538