mac: Remove a few symbols from framework.order
mac: Remove a few symbols from framework.order

We don't support NPAPI any more, so we don't export the NPAPI symbols.

I'm not sure why we needed the two narrowPrecision lines, but they've
been here since this file got added and I don't see them anymore in my local
build, so they're probably safe to remove. (If not, please revert this CL and
point me to a bot where they're needed.)

The NaCl symbols have been marked as hidden since
https://codereview.chromium.org/293009 (which landed before the CL that added
the two NaCl lines to this file, https://codereview.chromium.org/464046
– but the motivation in that CL is a coverage build, which we don't have anymore
anyways).

In the same vein, remove all the gcov symbols since we don't have a code coverage
build any more. If needed, we can add them back later.

Also remove _catch_exception_raise which was needed for breakpad. Now that
we use crashpad, this shouldn't be necessary.

No intended behavior change.

BUG=none

Review URL: https://codereview.chromium.org/1351143005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#349761}

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