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The typemapping configs are merged into their respective mojom target
definitions.

Bug: 1059389
Change-Id: I9882de654483126a8f9c048eade521fbbe4e918f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2407034
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807233}