Summary:
This removes the Hermes.setPauseOnLoad. It will be replaced by the more standard
Debugger.setInstrumentationBreakpoint's "beforeScriptExecution" event.
ChangeLog: [Internal] Remove Hermes.setPauseOnLoad message (to be replaced)
Reviewed By: mhorowitz
Differential Revision: D21418219
fbshipit-source-id: 93c53801c23487f9336b322c2bd737663ec21b97