EventSource: Synchronous loader callback not handled properly
https://bugs.webkit.org/show_bug.cgi?id=115104

Source/WebCore:

When attempting a cross-origin request towards a non-HTTP URL, an early verification
of the protocol scheme will cause didFailAccessControlCheck to be called synchronously
before the loader has even finished being created. This special case was not handled
properly, since we tried to cancel a non-existing loader, which resulted in a crash.
In addition to checking whether a request is in flight before trying to cancel it,
this change also schedules the initial creation of the loader to happen asynchronously
when an EventSource is constructed, so that a script can register for the error event
before it is dispatched (as a result of passing a non-HTTP URL to the constructor).

Patch by Per-Erik Brodin <per-erik.brodin@ericsson.com> on 2013-04-25
Reviewed by Alexey Proskuryakov.

Test: http/tests/eventsource/eventsource-cors-non-http.html

* page/EventSource.cpp:
(WebCore::EventSource::EventSource):
(WebCore::EventSource::create):
(WebCore::EventSource::scheduleInitialConnect):
(WebCore):
(WebCore::EventSource::scheduleReconnect):
(WebCore::EventSource::connectTimerFired):
(WebCore::EventSource::close):
(WebCore::EventSource::abortConnectionAttempt):
* page/EventSource.h:
(EventSource):

LayoutTests:

Patch by Per-Erik Brodin <per-erik.brodin@ericsson.com> on 2013-04-25
Reviewed by Alexey Proskuryakov.

* http/tests/eventsource/eventsource-cors-non-http-expected.txt: Added.
* http/tests/eventsource/eventsource-cors-non-http.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149098 268f45cc-cd09-0410-ab3c-d52691b4dbfc