Kill off some dodgy JS callbacks

Kill off some dodgy JS callbacks

None of these are currently reachable because the IsSafeMode
method always returns true.  This, in turn, will let us kill
off some file (as in fopen()) based parsing. That, in turn,
will let us kill of some more now-unreachable code.

In general, we don't want to have unsafe modes.

BUG=https://code.google.com/p/pdfium/issues/detail?id=116
R=jam@chromium.org

Committed: https://pdfium.googlesource.com/pdfium/+/c6ab1725213a487838cbe03cb08cb5cac4ad956a

[Tom Sepez, 2015-02-05 22:25:44]

tsepez@chromium.org changed reviewers:
+ jam@chromium.org

[Tom Sepez, 2015-02-05 22:25:45]

John, please review.

[jam, 2015-02-05 23:08:18]

lgtm

[Tom Sepez, 2015-02-05 23:27:30]

Committed patchset #2 (id:20001) manually as
c6ab1725213a487838cbe03cb08cb5cac4ad956a (presubmit successful).