Rename allowCookies to allowStoredCredentials

Rename allowCookies to allowStoredCredentials

And remove an redundant flag from WebURLRequest.
These two represent the same thing thus should be merged.

TEST=none
BUG=none
R=japhet@chromium.org, abarth@chromium.org, darin@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168867

[Hajime Morrita, 2014-03-07 03:13:38]

PTAL?

This is a cleanup.
I need this before landing my imports change.

Note that there is a small depending chrome side change.
I'll land that first.
https://codereview.chromium.org/189933002/

[abarth-chromium, 2014-03-07 05:55:12]

lgtm

[Hajime Morrita, 2014-03-10 19:50:09]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2014-03-10 19:50:28]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/morrita@chromium.org/189903002/1

[commit-bot: I haz the power, 2014-03-10 20:35:19]

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

[commit-bot: I haz the power, 2014-03-10 20:35:20]

Try jobs failed on following builders: mac_blink_rel

[Hajime Morrita, 2014-03-10 21:21:52]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2014-03-10 21:22:01]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/morrita@chromium.org/189903002/1

[commit-bot: I haz the power, 2014-03-10 22:17:10]

Change committed as 168867