Revert "Organize typemaps in //mojo/ shared for Blink variant"

This reverts commit b7b4d8b49070e38b1272d695ea375cec69ce6cba.

Reason for revert: Broke the build. See https://ci.chromium.org/p/chromium/builders/ci/linux-jumbo-rel/27199 for error logs.

Original change's description:
> Organize typemaps in //mojo/ shared for Blink variant
> 
> BUG=
> 
> Change-Id: Ie397047eb79a8639d5e14718f076c17376f9a252
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1619204
> Reviewed-by: Ken Rockot <rockot@google.com>
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Commit-Queue: Leon Han <leon.han@intel.com>
> Cr-Commit-Position: refs/heads/master@{#661602}

TBR=kinuko@chromium.org,rockot@google.com,leon.han@intel.com

Change-Id: Ief27985882451f335c81b40a3fa72ba004e7d963
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621481
Reviewed-by: Fergus Dall <sidereal@google.com>
Commit-Queue: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#661604}
4 files changed