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This eliminates all but a few .typemap files for Blink-variant
typemaps, replacing them with direct GN target settings
instead.

Bug: 1059389
Change-Id: Id8276f3256ac36e3f2bfc4ee02b0732064a727cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315439Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#791227}