[webkit-dev] Remember to guard a new feature with a runtime flag

[Ryosuke Niwa]

Hi all,

This is a remainder that all new Web facing features *must be guarded by a
runtime flag*, and *must be disabled by default* on trunk. See
https://webkit.org/feature-policy/ for the detailed information.

In general, it's never okay to introduce a new feature with a default-on
runtime flag.

- R. Niwa
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