Update wpt expected results.

Due to a mozlog bug, our automation didn't catch those changes.
Merge pull request #3064 from Ms2ger/fix-wpt

Update wpt expected results; r=jdm
Throw a catchable exception from ThrowingConstructor.
Merge pull request #3068 from Ms2ger/throwing-ctor

Throw a catchable exception from ThrowingConstructor; r=Manishearth