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This extracts the creation of request objects for WebRTC into a separate
file containing free functions. This better isolates this responsibility
and improves testability.

Fixed: 1134210
Change-Id: I817147d5c49dc0e461d4b54d07492e5a02f20ca7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2456867Reviewed-by: James Vecore <vecore@google.com>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Michael Hansen <hansenmichael@google.com>
Cr-Commit-Position: refs/heads/master@{#815238}