Bad indexing in CPDF_Document::FindPageIndex when page tree corrupt.

Moving to std::vector from the more forgiving CFX_ArrayTemplate
revealed the dubious page tree traversal, which depends on the
correctness of the /Count entries to properly summarize the total
descendants under a given node.

The only "correct" thing to do is to throw away these counts as parsed,
and re-compute them, perhaps in CountPages().  But I'm not willing to do
that since it may break unknown documents in the wild.

Pass out-params as pointers while we're at it.

BUG=680376

Review-Url: https://codereview.chromium.org/2636403003

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