Civil disobedience. Use the SecurityManager to justify not supporting setSecurityManager().

With this approach, the system boots with a special security manager that
permits everything except setting another security manager. This prevents
applications from installing a more strict security manager, which allows
us to avoid doing security checks throughout libcore.
http://b/issue?id=2585285

Change-Id: I7f38ac6bf5e2637e07790d34c6ccbbaf9874f4b0
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