Remove check of security origin of all ancestors when getUserMedia is called.

Remove check of security origin of all ancestors when getUserMedia is called.
This cl reverts back to the behaviour prior to https://codereview.chromium.org/795703003/. Ie, the security origin of the ancestors of a requesting iframe does not have to match in order to allow or deny a request.

BUG=448378, 456628
Committed: https://crrev.com/13e3803e300d13372e4032c1f036aab15f24223f
Cr-Commit-Position: refs/heads/master@{#318872}

[perkj_chrome, 2015-03-02 16:15:52]

perkj@chromium.org changed reviewers:
+ tommi@chromium.org

[perkj_chrome, 2015-03-02 16:15:53]

Can you please review.

[tommi (sloooow) - chröme, 2015-03-03 11:43:21]

lgtm

https://codereview.chromium.org/969773002/diff/1/chrome/browser/media/media_s...
File chrome/browser/media/media_stream_devices_controller.cc (right):

https://codereview.chromium.org/969773002/diff/1/chrome/browser/media/media_s...
chrome/browser/media/media_stream_devices_controller.cc:427: // Store sticky
permissions if |update_content_setting|.
nit: I don't think this comment adds much

[perkj_chrome, 2015-03-03 13:25:31]

The CQ bit was checked by perkj@chromium.org

[commit-bot: I haz the power, 2015-03-03 13:27:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/969773002/1

[commit-bot: I haz the power, 2015-03-03 14:42:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-03 14:43:11]

Patchset 1 (id:??) landed as
https://crrev.com/13e3803e300d13372e4032c1f036aab15f24223f
Cr-Commit-Position: refs/heads/master@{#318872}