backout f4add9815dd1 and db258cb900a7 because gcc 4.4 builds don't use -std=gnu++0x for decltype b=810274
merge backout b=810274
Back out 1ba9dc37c2ef:c6bc2193a72b (bug 877461) for b2g build bustage
CLOSED TREE
Fix stupid now-incorrect comment that keeps getting copied to new tests, no bug, r=ARGH