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It was forgetting to pass in dex_files.
Also adds in explicit calls to pFinish(), which according to the docs
should be necessary (although they don't seem to be).

BUG=674250

Change-Id: Iefab37b1ef77413f54d2b6e036700cdbb8bf361d
Reviewed-on: https://chromium-review.googlesource.com/575329Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487301}