Fix a ConcurrentModificationException when dumping resources

Since the sResourcesHistory set is synchronized, an attemp to modify the
set will block while the forEach() method is running in the rare case
resources are being dumped. With a normal for loop, modifying the set
while in the loop results in a ConcurrentModificationException.

Fixes: 219609463
Test: Manual
Change-Id: I9b7bb965aa390e5dec696be07599f777c807c1e3