Move destroying the web view to the WVC thread (previously it was on the UI thread)
Move destroying the web view to the WVC thread (previously it was on the UI thread)

Change-Id: I5a48734c6a244eadd1d60659f8e02ebb889a8fc1

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