Jim Miller e23ab8b1ac Selectively enable back button in keyguard for security screens.
This enables the back button on secure keyguard screens so the user can
get back to the initial screen.

Partial fix for bug 7094419

Change-Id: I4dc0ac8facfd2930ccb60710c36015ec1d2c8aa6
2012-09-16 15:50:37 -07:00
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