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This is a preparation step to migrate DevTools for shared workers to Mojo.
Drive-by: rewrite the test to use new DevToolsAgentHostObserver.

Bug: 776009
Change-Id: Ia1f3f4952e8d8ac834a36f94c680cb81e7c50e0e
Reviewed-on: https://chromium-review.googlesource.com/777740
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517832}