[XHR] Call internalAbort() before firing events

[XHR] Call internalAbort() before firing events

If we fire internalAbort() after handleRequestError(), a new request
initiated by the event handler reusing the same XHR instance will be
aborted.

BUG=402855
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180326

[sof, 2014-08-13 12:46:31]

lgtm

[tyoshino (SeeGerritForStatus), 2014-08-14 03:09:41]

The CQ bit was checked by tyoshino@chromium.org

[commit-bot: I haz the power, 2014-08-14 03:11:16]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tyoshino@chromium.org/462053002/1

[commit-bot: I haz the power, 2014-08-14 10:37:27]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_blink_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/2...)

[commit-bot: I haz the power, 2014-08-14 13:08:55]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-14 13:08:56]

Try jobs failed on following builders:
  linux_blink_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/2...)

[tyoshino (SeeGerritForStatus), 2014-08-15 03:42:46]

The CQ bit was checked by tyoshino@chromium.org

[commit-bot: I haz the power, 2014-08-15 03:43:02]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tyoshino@chromium.org/462053002/1

[commit-bot: I haz the power, 2014-08-15 04:39:50]

Committed patchset #1 (1) as 180326