Use SolarMutexGuard directly

Change-Id: I4b245dd68bf032a1d74fb16b910dc952fd761781
Remove unused ThreadHelpBase base

Change-Id: I0e15184071fc2c1cb231ead98210d4a1654208e7
Use SolarMutexGuard directly

Change-Id: If09abe4dd6191efa5f92bf3af7cc6e119f401ab8
Use SolarMutexGuard directly

(both users of PropertySetHelper use a SolarMutex-based ThreadHelpBase)

Change-Id: If542914bbf33a9e81f86d654498c2af04082f31d
Use SolarMutexGuard directly

Change-Id: I58bb5ede9c59f16d556db3c1e2f254eeba1c8f7d
Use SolarMutexGuard directly

Change-Id: I4533504d110dadbabfc737f7ca56b88afcc8ef44