DevTools: Fix console message text rendering when RTL is present

R=aandrey,eustas
BUG=178635
NOTRY=true

Review URL: https://codereview.chromium.org/212653002

git-svn-id: svn://svn.chromium.org/blink/trunk@170059 bbb929c8-8fbe-4397-9dbb-9b2b20218538