Be more particular about FX objects constructed from JS

This is back-filling some more error cases from the work from
a few weeks ago.

Replaces a lambda with a static CallHandler() method since the
verbosity was increasing. It gets invoked if you try to make a new
FXJS object from the javascript side, rather than the C++ side.

Making such an object is a little tricky, since we don't give
these functions names in V8, but they can be obtained via constructor
property from an instance of the object.


Change-Id: Ibca686e75338ac54d08a114f36f930cd424a1eb5
Reviewed-on: https://pdfium-review.googlesource.com/c/44534
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

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