Add .url attribute alongside .URL in EventSource and WebSocket to comply with the specs but not break existing usage.
https://bugs.webkit.org/show_bug.cgi?id=40899

Patch by Pablo Flouret <pablof@motorola.com> on 2012-01-21
Reviewed by Adam Barth.

Source/WebCore:

Tests: fast/eventsource/eventsource-url-attribute.html
       http/tests/websocket/tests/hixie76/url-attribute.html
       http/tests/websocket/tests/hybi/url-attribute.html

* page/EventSource.idl:
* websockets/WebSocket.idl:

LayoutTests:

* fast/eventsource/eventsource-url-attribute-expected.txt: Added.
* fast/eventsource/eventsource-url-attribute.html: Added.
* http/tests/websocket/tests/hixie76/url-attribute-expected.txt: Added.
* http/tests/websocket/tests/hixie76/url-attribute.html: Added.
* http/tests/websocket/tests/hybi/url-attribute-expected.txt: Added.
* http/tests/websocket/tests/hybi/url-attribute.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105580 268f45cc-cd09-0410-ab3c-d52691b4dbfc