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This API is requested by the chromevox extension manifest but not
used in chromecast.  This causes a DCHECK failure in the manifest
permissions parser.  Adding the feature/permission here so DCHECK
doesn't cause failure to install the extension in eng builds.

Test: Local build with x86 chromecast simulator (eng)
Bug: None
Change-Id: I9ceb769b768f15ab523653afe3defc7f1627d9a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007477Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733447}