Eliminate deferred surface destruction.

Removing the code that delays a surface destruction when
WindowManager.FLAG_KEEP_SURFACE_WHILE_ANIMATING is set. The lock
screen that continued to animate after destroySurfaceLocked is no
longer used and this code was causing problems.

Also mDrawState was being set to NO_SURFACE in destroySurfaceLocked
even if the surface ended up not being destroyed. Later when it was
reused the false value of mDrawState was messing things up.

The screen lock bug referenced below no longer levaes the user stuck
with a black lockscreen. However it occasionally powers back up in the
launcher screen rather than the lock screen.

Fixes bug 6485955.

Change-Id: I684104c7e7c39c161a5118aa890889fbae92e635