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WebView uses a similar approach to disable features that are not
supported. This allows feature detection for APIs that are not yet
supported.

Change-Id: I1ee0f7a9752658b4d365ee42e5f29cb674af2d4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879680Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709586}