Enable ExperimentalWebSocket under "Experimental Web Platform Features".
Enable ExperimentalWebSocket under "Experimental Web Platform Features".

Since most of layout tests pass, I would like to expose it for
experimental users.

BUG=226931
R=tkent@chromium.org

Review URL: https://codereview.chromium.org/228033003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@171104 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs