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ConversionInternalsUI and ProcessInternalsUI don't need to be
WebContentsObservers at all, since WebUIController already provides a
RenderFrameCreated() override that is scoped WebUI-specific
RenderFrameHosts.

Bug: 1148682, 1149125
Change-Id: Iebef544d7fb7c8938d273c84279ce7e8b19f90a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566889Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832563}