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This will allow for us to break unnecessary abstractions between these
two components and collapse duplicate types (e.g. the two separate
RenderFrameObservers).

Followup CLs will remove the test_runner namespace, and move the files
into the //content/shell/renderer/web_test directory.

R=avi@chromium.org

Bug: 866140
Change-Id: If509c311337b94df7085a6f6b115872678d3635d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2140301
Commit-Queue: Avi Drissman <avi@chromium.org>
Auto-Submit: danakj <danakj@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757208}