[Presentation API] Move sandbox check to PresentationRequest ctor

[Presentation API] Move sandbox check to PresentationRequest ctor

Fix PresentationRequest_sandboxing_error.html.

BUG=705170

[zhaobin, 2017-03-27 19:37:42]

zhaobin@chromium.org changed reviewers:
+ imcheng@chromium.org, mfoltz@chromium.org

[imcheng, 2017-03-27 23:15:42]

lgtm

[mark a. foltz, 2017-03-27 23:38:07]

lgtm

[mark a. foltz, 2017-03-27 23:38:48]

ALso, it would be great to write layout test for this (assuming one was missing
before).

[zhaobin, 2017-03-28 00:42:11]

The CQ bit was checked by zhaobin@chromium.org to run a CQ dry run

[zhaobin, 2017-03-28 00:42:24]

On 2017/03/27 23:38:48, mark a. foltz wrote:
> ALso, it would be great to write layout test for this (assuming one was
missing
> before).

Done.

[commit-bot: I haz the power, 2017-03-28 00:42:39]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-28 02:00:02]

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

[commit-bot: I haz the power, 2017-03-28 02:00:03]

Dry run: Try jobs failed on following builders:
  linux_chromium_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[mark a. foltz, 2017-03-28 15:59:11]

lgtm

[mark a. foltz, 2017-03-28 15:59:21]

The CQ bit was checked by mfoltz@chromium.org

[mark a. foltz, 2017-03-28 15:59:21]

The patchset sent to the CQ was uploaded after l-g-t-m from imcheng@chromium.org
Link to the patchset: https://codereview.chromium.org/2780583003/#ps20001
(title: "add layout test")

[commit-bot: I haz the power, 2017-03-28 16:00:00]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-28 17:32:12]

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

[commit-bot: I haz the power, 2017-03-28 17:32:13]

Try jobs failed on following builders:
  win_chromium_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)