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The field is true when there is no routing id for the main frame (ie
there is a proxy main frame), and false otherwise. So we can just use
that.

In the browser side it is actually a separate state, is_active_ on the
RenderViewHostImpl. However it is always set to true/false when the
main frame routing id is set as well. So we remove it and have
is_active() report if the main frame routing id is present instead.

R=alexmos@chromium.org
TBR=dcheng

Change-Id: I87c89f9d06ec99e769528e164e0ea0ed3d6fc6bc
Bug: 419087
Reviewed-on: https://chromium-review.googlesource.com/c/1336210
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608799}