frameworks/base: Fix USB media removed notification to be dismissable

Cleanly removing a USB media after unmounting leaves a permanent notification.
This fix makes it dismissable.

Change-Id: Ib6fb77f9ebfb15a60c5c29d10d3090feebc881df
Revert "Keyguard: Use translucent UI"

This isn't the correct implementation. We should be enabling transparency in the status bar and navigation bar through: <bool name="config_enableLockScreenTranslucentDecor">true</bool> in frameworks-res.

This MIGHT also be the cause for transparency to not be working properly sometimes upon wake, but not sure about that yet.

This reverts commit 81ead53ff75deb3ee7e3ff186c8eff835bf0d2ea.

Change-Id: I66f88cc02cae05bc7ae6198ad740c86cd466e76a
Merge "Revert "Keyguard: Use translucent UI"" into android-4.4
merge changes from Omni 4.4 into local branch