The third argument of addEventListener/removeEventListener of PeerConnection should...

The third argument of addEventListener/removeEventListener of PeerConnection should be optional
https://bugs.webkit.org/show_bug.cgi?id=77606

Reviewed by Adam Barth.

Source/WebCore:

This patch corrects a typo in PeerConnection.idl, i.e. [optional] => [Optional].

Test: fast/mediastream/peerconnection-eventlistener-optional-argument.html

* mediastream/PeerConnection.idl:

LayoutTests:

The added test confirms if the third argument of addEventListener() and
removeEventListener() is optional.

* fast/mediastream/peerconnection-eventlistener-optional-argument-expected.txt: Added.
* fast/mediastream/peerconnection-eventlistener-optional-argument.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106539 268f45cc-cd09-0410-ab3c-d52691b4dbfc