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The testEnterExitFullscreenWithControlsButton test in
VideoFullscreenOrientationLockTest attempts to click on the
fullscreen button in the video controls panel via hardcoded
offsets from the bounds of the video element.

These offsets assume there are no other buttons placed to the
right of the fullscreen button, but in some circumstances the
cast button will appear and cause the test to fail when the
fullscreen button is not where the test expects it to be.

This commit ensures that the test video never shows the cast
button in the controls panel.

Note: The download button does not need to be disabled because
the media src is detected as being a local file and this causes
the download button to not be shown.

BUG=None

TEST=Every test class that uses video-player.html:
     FullscreenVideoTest, VideoFullscreenOrientationLockTest,
     VideoFullscreenOrientationLockChromeTest, FullscreenActivityTest

Change-Id: Ia14b8e515f0ea6510bfa54fce0fa2f809d4a22b1
Reviewed-on: https://chromium-review.googlesource.com/915017Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536774}