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All typemap files have been converted to inlined GN target
configuration. This removes all support for aggregating .typemap files
at buildgen time and any associated build logic needed to process those
files.

Fixed: 1059389
Change-Id: Iabf8b8680d3bd9c9e310830c36a01c1c8ca5c389
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2408274
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807277}