Remove TestRunner.SetMIDISysexPermission shell.
Remove TestRunner.SetMIDISysexPermission shell.

This CL is part of a suite of four patches:
Part 1: https://codereview.chromium.org/1100843003
Part 2: https://codereview.chromium.org/1100673004
Part 3: https://codereview.chromium.org/1097933006
Part 4: <this>

BUG=475141

Review URL: https://codereview.chromium.org/1095233005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#326619}

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