Make ChromeOmniboxNagivationObserverTest a ChromeRenderViewHostTestHarness

This simplifies the test fixture and allows the tests to pass in
single process mash.

(Technically, they also pass in single process mash without this change,
but would cease to do so after AuraTestSuite stops creating an
InputDeviceClient, which will soon happen.)

Bug: 905430
Change-Id: I067e2e0affcf3f0b95fa687f303882a6233cb1cf
Reviewed-on: https://chromium-review.googlesource.com/c/1343341
Reviewed-by: Kevin Bailey <krb@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609751}
1 file changed