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This change gets rid of the EditText we were using in
InstrumentationTestActivity for weblayer instrumentation tests and
replaces it with a UrlBarView returned by UrlBarViewController.

All relevant methods have been updated, and a small UrlBarControllerTest
added to verify expected behavior.

This was previously reviewed and submitted here:
https://chromium-review.googlesource.com/c/chromium/src/+/2270442

Geolocation tests were failing on Android L after this change:
https://luci-logdog.appspot.com/logs/chromium/android/swarming/logcats/4d4937bf36d05911/+/logcat_logcat_org.chromium.weblayer.test.GeolocationTest.testGeolocation_denyFromPrompt_20200708T215038-UTC_05fcae3f0ae58958
but making them load a static HTML page fixes that.

Bug: None
Test: ./out/<build_dir>/bin/run_weblayer_instrumentation_test_apk
Change-Id: Ia455e56c1424af714659b1b32b8af6a7a6dafa54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2289976Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787658}