Bug 1076969 - processLeakLog should come up with reasonable defaults itself. r=jmaher

Instead of grabbing attributes off options at every call site, pass
in the options object to processLeakLog, and attempt to get the attributes
there. If not present, use a restrictive default value.

This will prevent silent harness failures if one of the many ways to invoke
processLeakLog fails to set up these options, and makes it so they
don't have to set it up if they don't care.