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This reverts commit 2714fec9.

Reason for revert: Breaks GN's MSVC generator, https://crbug.com/1059666

Original change's description:
> Support typemaps inlined as GN targets
> 
> This introduces support for typemaps specified as GN targets, with new
> cpp_typemaps and blink_cpp_typemaps variables that mojom() targets can
> used to reference their typemap rules.
> 
> The underlying work to use the typemap configuration is shared with the
> existing typemap infrastructure, but the net result is that we no longer
> need separate .typemap files or global "bindings configurations" once
> everything is converted to this approach.
> 
> Bug: 1059389
> Change-Id: Id2e5fe765d3c7600a3f50e337fb693f1b3a3cc0a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090716
> Commit-Queue: Ken Rockot <rockot@google.com>
> Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#747990}

TBR=rockot@google.com,oksamyt@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1059389
Change-Id: I060cf9d20c7d03c930296a9e777ab5e8c4e2a7b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2093136Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748211}