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The `Save` operation in chrome://media-app started failing after
r749464. Console errors like `createWriter` is undefined.

r749464 tore out the old API and replaced it with a new one.
Unfortunately, this only changed IDL files, and not the externs file
that JS needs to compile against.

This change updates the externs file to match the IDL file, making the
regression detectable at compile time.

Filed b/151394309 to investigate ways to detect when the externs file
does not match the idl files and complain about it.

The externs file is verbatim from cl/300232012.

Bug: 1061813
Change-Id: I2de55447b640aec3338640db75a323a877beffde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2103011Reviewed-by: Bugs Nash <bugsnash@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750852}