Remove obsolete DoubleCheckedLocking check.
Remove obsolete DoubleCheckedLocking check.

tempbottle/jsimpledb,permazen/permazen,tempbottle/jsimpledb,archiecobbs/jsimpledb,archiecobbs/jsimpledb,archiecobbs/jsimpledb,permazen/permazen,permazen/permazen,tempbottle/jsimpledb