Don't change the window disposition for new windows without a user gesture

Don't change the window disposition for new windows without a user gesture

The popup blocker will block them anyways, and if it's disabled, we
shouldn't change the disposition chosen by the web page

BUG=158274
Committed: https://crrev.com/c5cfa6423d112b5ff0bb2a863ebe5fe2f5ac7cc3
Cr-Commit-Position: refs/heads/master@{#292931}

[jochen (gone - plz use gerrit), 2014-09-02 12:10:10]

jochen@chromium.org changed reviewers:
+ bauerb@chromium.org

[jochen (gone - plz use gerrit), 2014-09-02 12:10:11]

Bernhard, mind having a look?

[Bernhard Bauer, 2014-09-02 12:11:55]

LGTM, in particular in light of Darin's comment.

[jochen (gone - plz use gerrit), 2014-09-02 12:17:06]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2014-09-02 12:18:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jochen@chromium.org/527913002/1

[jochen (gone - plz use gerrit), 2014-09-02 12:44:47]

The CQ bit was unchecked by jochen@chromium.org

[jochen (gone - plz use gerrit), 2014-09-02 13:02:43]

fyi, updated test expectations of the failing tests.

[jochen (gone - plz use gerrit), 2014-09-02 14:42:44]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2014-09-02 14:43:21]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jochen@chromium.org/527913002/20001

[commit-bot: I haz the power, 2014-09-02 15:31:48]

Committed patchset #2 (id:20001) as f0eec1fd6fdf7bb7b8a18bce18ffb3c8e814efca

[commit-bot: I haz the power, 2014-09-10 03:18:39]

Patchset 2 (id:??) landed as
https://crrev.com/c5cfa6423d112b5ff0bb2a863ebe5fe2f5ac7cc3
Cr-Commit-Position: refs/heads/master@{#292931}