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This feature has two problems:

- its name is bad and non-inclusive
- it's no longer needed with inlined typemap definitions

This converts the one remaining dependent typemap to an inlined
typemap configuration in GN.

Fixed: 1097211
Change-Id: I9515ada1bc833f1306f12b2bcae14a59f1257645
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2255123
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Auto-Submit: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#781480}