Add "Symbol" to the list of expected global constructors

ECMAScript 6 Symbols were enabled by default in V8 in
https://code.google.com/p/v8/source/detail?r=22831.
This patch adds the proper baselines and marks the tests
as failing. They'll start passing again after the next roll.

BUG=400507
NOTRY=true

Review URL: https://codereview.chromium.org/436353002

git-svn-id: svn://svn.chromium.org/blink/trunk@179499 bbb929c8-8fbe-4397-9dbb-9b2b20218538