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Remove use of CallJavascriptFunctionUnsafe from net_internals_ui.cc.

Update BrowserBridge to class based syntax and use sendWithPromise as
needed.

handler occurs like in production code, so cannot easily be stubbed
out with a TestBrowserProxy. Therefore, moved test observers to the
class being tested.

Note: Unlike many WebUI tests, these tests assume a round trip to the
Change-Id: Id2453205e1bdc912b5e20aeba12f1082ed09629d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2634129
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845033}