Revert of Fix ExtensionPopup close issue.

Revert of Fix ExtensionPopup close issue. (https://codereview.chromium.org/321093002/)

Reason for revert:
Have to revert this. There is some cases such as when in extension open a new tab with window.open or  a link, this will crash the browser.See bug 390128.

Original issue's description:
> Fix chrome.extension.getViews returns multiple popup windows.
> 
> When we invoke +[ExtensionPopupController showURL:...],
> we close the old Popup using [gPopup close],but we don't
> release it here. So host_ is only released 
> when -[ExtensionPopupController windowWillClose] is invoked.
> At this time, the new popup might be ready. And when we use
> chrome.extension.getViews or some other apis we might get
> the dying window.
> So move shutdown of host_ from -[ExtensionPopupController windowWillClose]
> into -[ExtensionPopupController close].
> 
> BUG=376511
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=276355

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=281153

[Xuefei Ren, 2014-07-02 06:07:10]

Created Revert of Fix ExtensionPopup close issue.

[commit-bot: I haz the power, 2014-07-02 06:08:51]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xrenishere@gmail.com/364783003/1

[commit-bot: I haz the power, 2014-07-02 06:08:52]

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

[commit-bot: I haz the power, 2014-07-02 06:08:52]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Xuefei Ren, 2014-07-02 06:40:24]

Hi there,
  I am reverting this patch,but the bot said I need a LGTM from a full
committer.

[Mark Mentovai, 2014-07-02 12:25:46]

LGTM

[Mike Wittman, 2014-07-02 17:10:02]

The CQ bit was checked by wittman@chromium.org

[commit-bot: I haz the power, 2014-07-02 17:11:32]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xrenishere@gmail.com/364783003/1

[commit-bot: I haz the power, 2014-07-02 19:44:31]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[commit-bot: I haz the power, 2014-07-02 20:00:39]

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

[commit-bot: I haz the power, 2014-07-02 20:00:40]

Try jobs failed on following builders:
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[Mike Wittman, 2014-07-02 20:53:38]

The CQ bit was checked by wittman@chromium.org

[commit-bot: I haz the power, 2014-07-02 20:54:15]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xrenishere@gmail.com/364783003/1

[commit-bot: I haz the power, 2014-07-02 21:03:35]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[commit-bot: I haz the power, 2014-07-02 21:17:09]

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

[commit-bot: I haz the power, 2014-07-02 21:17:09]

Try jobs failed on following builders:
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[Xuefei Ren, 2014-07-03 01:51:48]

The CQ bit was checked by xrenishere@gmail.com

[commit-bot: I haz the power, 2014-07-03 01:52:48]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xrenishere@gmail.com/364783003/1

[commit-bot: I haz the power, 2014-07-03 03:26:04]

Change committed as 281153