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This is a preparation to replace routing id + legacy IPC with Mojo interface
retrievable from SharedWorkerHost.

Temporarily duplicated some code from WorkerDevToolsAgentHost, which
makes it possible to migrate shared and service workers separately.

Removed a test for WORKER_STATE manipulations altogether with the state itself.

Bug: 776009
Change-Id: Id884f4f5009eb70148251c94cae9629d5a1f6e8e
Reviewed-on: https://chromium-review.googlesource.com/783110
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521277}