DevTools: [Console] Display timestamps when the Console timestamps setting is re-enabled

Drive-by: Do not subscribe each message to the timestamp display setting but rather the ConsoleMessageView

R=eustas, vsevik
BUG=357175
NOTRY=true

Review URL: https://codereview.chromium.org/214693005

git-svn-id: svn://svn.chromium.org/blink/trunk@170190 bbb929c8-8fbe-4397-9dbb-9b2b20218538