Revert of Unload all apps / extensions when deleting a profile.

Revert of Unload all apps / extensions when deleting a profile. (https://codereview.chromium.org/266343002/)

Reason for revert:
Caused crash in official builds when deleting profiles while the chrome:chrome-signin tab is open

BUG=374683
TBR=kalman, sky

Original issue's description:
> Unload all apps / extensions immediately when deleting a profile.
> 
> Previously apps could remain running with references to profiles that had been deleted by users, but before the browser shut down and profiles were fully removed. Problems included E.g. opening a link in an app would open a tab in the deleted profile.
> 
> Relanding patch: ShutdownStartupCycle failed in build [49353], this patch was speculatively reverted in r269383 [49355], but ShutdownStartupCycle failed again in [49362] after the revert had landed.
> 
> [49353] http://build.chromium.org/p/chromium.mac/builders/Mac%2010.6%20Tests%20%28dbg%29%281%29/builds/49353
> [49355] http://build.chromium.org/p/chromium.mac/builders/Mac%2010.6%20Tests%20%28dbg%29%281%29/builds/49355
> [49362] http://build.chromium.org/p/chromium.mac/builders/Mac%2010.6%20Tests%20%28dbg%29%281%29/builds/49362
> 
> BUG=368684
> TEST=Manual testing as described on http://crbug.com/368684#c1
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269343
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=270890

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271926

[scheib, 2014-05-21 16:59:25]

Created Revert of Unload all apps / extensions when deleting a profile.

[scheib, 2014-05-21 18:25:39]

Committed patchset #1 manually as r271926 (presubmit successful).