Simplify destructors
Simplify destructors

Remove explicit clear() when the order doesn't matter.

Change-Id: I5931bc7ef5f681c7ce329aa9ec0a6e46d34a56c5

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base