Summary:
In several pervious diffs we have moved symbolication of JS stack traces
to the packeger. This lets us save a bunch of memory (~80MB) and CPU on device,
reduces dependency on JS after exception occured.
This diff cleans up a bunch of code that was used to do symbolication on client side.
Reviewed By: javache
Differential Revision: D3348676
fbshipit-source-id: 88baa5c502836c9ca892896e1ee5d83db37486d3