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This is a preparation step to migrate DevTools for shared workers to Mojo.

Bug: 776009
Change-Id: I3960cb7ae593f5c46ef8b28b2c70b6b5d2a2e722
Reviewed-on: https://chromium-review.googlesource.com/777746
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517900}