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Currently, renderer-side objects (RenderFrame, RenderView, etc.) assume
the AgentSchedulingGroup outlives them, but this is not the case if the
disconnect handler is called before they are destroyed.

After this CL, the ASG's lifetime will match the RenderThread's, and it
will be destroyed when the RenderThread is destroyed. This is OK for
now, since we currently only have a single ASG per process and the
host's lifetime matches the RenderProcessHost's. In the meantime,
kouhei@ is working on properly shutting down ASGs via an IPC, similar to
other objects.

Bug: 1137580, 1138942
Change-Id: Iab02cecf3cd828a0b84f2bc29e451d1a591422ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2478622
Commit-Queue: Tal Pressman <talp@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819238}