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This class was used to mock out console log requests flowing through
RenderFrameHost. Now all unit tests can get the same functionality from
TestRenderFrameHost/RenderFrameHostTester, without injecting a mock.

Bug: None
Change-Id: I76a2603e48c9e7afd97a9b85da12ae2d4fe5714f
Reviewed-on: https://chromium-review.googlesource.com/748770
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513219}