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A static code analyzer reports an error in usb_midi_output_stream.cc, which
is a message_size_table buffer overflow. This CL fixes the code.
Note that the reported error never happens and hence the fix doesn't change
the behavior.

BUG=427616

Review URL: https://codereview.chromium.org/694733002

Cr-Commit-Position: refs/heads/master@{#302560}