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If a file read failed only MOJO_RESULT_ABORTED was returned.
This change does a best effort mapping of base::File::Error
values to the MojoResult value.

Bug: none
Change-Id: Iead2b3ce3b790960d5796ceeb15cfa1ff9c80741
Reviewed-on: https://chromium-review.googlesource.com/804615
Commit-Queue: Chris Mumford <cmumford@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521543}