Correctly handle CORS access checks over cache-validating responses.

Correctly handle CORS access checks over cache-validating responses.

If a CORS-enabled load of a resource is also done conditionally, the
response may be a 304 (Not Modified.) That 304 response is not
required (nor expected) to have any CORS headers included, so arrange
for the required CORS access control check to be performed over the
cached resource having been (successfully) validated.

R=
BUG=339058
TEST=http/tests/security/script-crossorigin-fails-cross-origin-conditional

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=166188

[sof, 2014-01-30 12:06:12]

When you get a chance next, please take a look.

My bad - I previously failed to grasp how memory cache validation is done wrt
resource loading steps.

[Nate Chapin, 2014-01-30 18:40:53]

lgtm

[commit-bot: I haz the power, 2014-01-30 18:41:06]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sigbjornf@opera.com/146853003/1

[commit-bot: I haz the power, 2014-01-30 23:00:34]

Retried try job too often on linux_blink for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_blin...

[commit-bot: I haz the power, 2014-01-30 23:00:41]

CQ bit was unchecked on CL. Ignoring.

[commit-bot: I haz the power, 2014-01-30 23:00:43]

CQ bit was unchecked on CL. Ignoring.

[commit-bot: I haz the power, 2014-01-30 23:02:21]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sigbjornf@opera.com/146853003/1

[commit-bot: I haz the power, 2014-01-31 01:52:42]

Retried try job too often on linux_blink for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_blin...

[commit-bot: I haz the power, 2014-01-31 01:52:43]

CQ bit was unchecked on CL. Ignoring.

[commit-bot: I haz the power, 2014-01-31 01:52:44]

CQ bit was unchecked on CL. Ignoring.

[commit-bot: I haz the power, 2014-01-31 04:56:52]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sigbjornf@opera.com/146853003/1

[commit-bot: I haz the power, 2014-01-31 06:41:30]

Change committed as 166188

[commit-bot: I haz the power, 2014-01-31 06:41:32]

CQ bit was unchecked on CL. Ignoring.

[commit-bot: I haz the power, 2014-01-31 06:41:52]

CQ bit was unchecked on CL. Ignoring.