Revert "Bug 1047645 - Use manual timeout to guard _closed event from not firing r=alive" for JS exceptions

This reverts commit e13cc05b6d615664d769e55b60754480848d076b.
Bug 1047645 - Use manual timeout to guard _closed event from not firing r=alive
Merge pull request #22851 from 6a68/bug-1048994-fxa-tospp-l10n-back-button

Bug 1048994 - Properly render tos/pp in v2.0 after hitting 'back' button...
Merge pull request #22849 from 6a68/bug-1041034-email-input-obscured

Bug 1041034 - Remove FF logo from FxA to ensure email input is not obscu...
Revert "Bug 1047645 - Use manual timeout to guard _closed event from not firing r=alive"

This reverts commit bf33987e2729e82f1e3891eba3e85713f476fd0e.
Bug 1047645 - Use manual timeout to guard _closed event from not firing r=alive
Merge pull request #22942 from KevinGrandon/bug_1047645_to_2_dot_oh_2

Bug 1047645 - Use manual timeout to guard _closed event from not firing