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This CL cleans up old Mojo types for mojom::ChildProcess with
removing ChildProcessRequest.

Bug: 955171
Change-Id: I8b95086f4c3c2cc39d559ff32f983a0c60f335f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879629Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#709754}