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Update the tests to use the test UI API, which is implemented using the
Views Cast dialog, replacing the use of the WebUI dialog. Some changes
are made to the test UI API to better suit the needs of the tests.

This re-enables many tests that were previously disabled for being flaky.

Local file casting tests (5 test cases) are disabled in this CL, and
will be implemented in a later CL:
DISABLED_OpenLocalMediaFileInCurrentTab
DISABLED_OpenLocalMediaFileInNewTab
DISABLED_OpenLocalMediaFileFailsAndShowsIssue
DISABLED_OpenLocalMediaFileFullscreen
DISABLED_OpenLocalMediaFileCastFailNoFullscreen

The following tests are still flaky, so they are marked MANUAL and will
be run only on the private waterfall until they are fixed:
MediaRouterIntegrationBrowserTest.MANUAL_Fail_NoProvider
MediaRouterIntegrationBrowserTest.MANUAL_Dialog_Basic
MediaRouterIntegrationBrowserTest.MANUAL_Dialog_RouteCreationTimedOut
MediaRouterIntegrationOneUABrowserTest.MANUAL_SendAndOnMessage
MediaRouterIntegrationOneUABrowserTest.MANUAL_ReceiverCloseConnection

Bug: 900248
Change-Id: Ie328fd1c4b606a7f8291d8d22b7d83a89f1ee666
Reviewed-on: https://chromium-review.googlesource.com/c/1338226
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611479}