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Notable changes:

1.) Use C-functions helpers instead of WebIntTest method. This will
    allow to switch NavigationAndLoadCallbacksTest to a simpler base
    class in the future.
2.) Added test::WaitForPageToFinishLoading C-function, which can be
    used across multiple tests to wait for pageload.
3.) Removed extra usage of web:: because NavigationAndLoadCallbacksTest
    is already placed into web namespace.
4.) Removed web_state()->SetDelegate(nullptr); calls, because unlike
    WebIntTest, WebTestWithWebState does not set a web delegate.

Bug: None
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: If5f26f1da40a90fde6378964b0f29a6ac30c16bb
Reviewed-on: https://chromium-review.googlesource.com/1056203
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558908}