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Otherwise, after transferring ownership the old
base_file will always be invalid and we get spurious
error logs, which can be confusing.

This started happening after the refactoring in r274783.
https://codereview.chromium.org/307173002/diff/80001/components/nacl/renderer/pnacl_translation_resource_host.cc

Alternatively, could have checked the file_handle variable that
ends up owning the base_file at the later point, but might as
well check it earlier.

BUG=none
(but it bugged ncbray =))

Review URL: https://codereview.chromium.org/982663002

Cr-Commit-Position: refs/heads/master@{#319170}