Revert 273866 "Block content scripts from executing until user g..."

Revert 273866 "Block content scripts from executing until user g..."

Referring to https://code.google.com/p/chromium/issues/detail?id=379472,
This is causing significant stability on trunk.  Reverting.

> Block content scripts from executing until user grants permission
> 
> Prevent extensions with <all_urls> from running content scripts without user
> consent if the scripts-require-action switch is on.
> 
> BUG=362353
> 
> Review URL: https://codereview.chromium.org/288053002

TBR=rdevlin.cronin@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=274102

[dxie1, 2014-06-01 02:16:48]

Committed patchset #1 manually as r274102 (tree was closed).