Revert of Support "Pin to taskbar" for hosted app windows.

Revert of Support "Pin to taskbar" for hosted app windows. (https://codereview.chromium.org/258243002/)

Reason for revert:
Suspect to cause failure on Vista machines: http://build.chromium.org/p/chromium.win/builders/Vista%20Tests%20%283%29/builds/40163

Original issue's description:
> Support "Pin to taskbar" for hosted app windows.
> 
> This CL allows hosted app windows to be pinned to the taskbar by
> right-clicking the taskbar icon and pressing the "Pin to taskbar" button.
> 
> This CL pulls out the code that sets the relaunch details of v2 app
> windows into web::UpdateRelaunchDetails.
> 
> BUG=368101
> TEST=Run a hosted app as a window. Pin it from the taskbar icon right click
> menu. Relaunch the app from the pinned icon.
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272851


NOTRY=true
NOTREECHECKS=true
TBR=calamity@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272866

[sergeyv, 2014-05-26 19:07:54]

Created Revert of Support "Pin to taskbar" for hosted app windows.

[commit-bot: I haz the power, 2014-05-26 19:09:02]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sergeyv@chromium.org/298003005/1

[commit-bot: I haz the power, 2014-05-26 19:09:03]

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

[commit-bot: I haz the power, 2014-05-26 19:09:03]

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.

[sergeyv, 2014-05-26 19:27:43]

The CQ bit was checked by sergeyv@chromium.org

[commit-bot: I haz the power, 2014-05-26 19:28:10]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sergeyv@chromium.org/298003005/1

[commit-bot: I haz the power, 2014-05-26 19:34:17]

Change committed as 272866