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Cleanup a bit WebUI tests in render_frame_host_manager_unittest.cc

The WebUI tests in render_frame_host_manager_unittest.cc have some
code that is no longer necessary or can be streamlined a bit. There is
also a test that no longer matches reality, so I'm removing it as well
as some accidental copy/paste duplicate expectations.

Bug: 713313, 1002276
Change-Id: I29a0b3c0dea69bbef3eaff5df1dce08127333a00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849439
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705106}