Remove synchronization in WifiMonitorSingleton.
Remove synchronization in WifiMonitorSingleton.

This isn't really required because the static initializer
for WifiMonitorSingleton won't run until the first access
to the (non primitive) static field "sInstance". Further,
static initializers will be run precisely once (i.e
first accesses to sInstance from multiple threads are safe).

Change-Id: I78fae225e4c5cb917e7e7817522595ae026daf47

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