DevTools: [Elements] Use "unicode-bidi" for correct rendering of HTML entities in RTL

R=aandrey, eustas, vsevik
BUG=330387

Review URL: https://codereview.chromium.org/109053003

git-svn-id: svn://svn.chromium.org/blink/trunk@164290 bbb929c8-8fbe-4397-9dbb-9b2b20218538