Fix crash in CXFA_Node::TryUserData() (speculative)

Fix is speculative because I can't repro locally, but I know the
current code is wrong.

I fixed this intially in https://codereview.chromium.org/2015143005/
I then broke it again in https://codereview.chromium.org/2019333006/

There is another spot where we are still casting through void*, and
the CXFA_Node*'s alignment is getting messed up when it fails to adjust
for it's vtable.  Using CFXJSE_HostObject consistently avoids the issue.

Adding a virtual dtor to CFXJSE_HostObject might skirt the issue, but
I want to be able to wrap simple objects without that penalty if
desired.

BUG=616339

Review-Url: https://codereview.chromium.org/2055473004

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