WebXR: reenable hittest test case that was flaky

(potential) Fix for flakiness has already landed, but the test got
disabled before that happened. This CL will reenable the test.

In case the fix is not sufficient to get rid of flakiness, the test
logic will have to be rewritten.

Bug: 1112773
Change-Id: Ifeb07c6b9cf30e587d7804f0b3af9e345e550c5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346923
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Auto-Submit: Piotr Bialecki <bialpio@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796956}

chrome/android/javatests/src/org/chromium/chrome/browser/vr/WebXrArHitTestTest.java

@@ -21,7 +21,6 @@ import org.chromium.base.test.params.ParameterAnnotations.UseRunnerDelegate;
 import org.chromium.base.test.params.ParameterSet;
 import org.chromium.base.test.params.ParameterizedRunner;
 import org.chromium.base.test.util.CommandLineFlags;
-import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.MinAndroidSdkLevel;
 import org.chromium.chrome.browser.flags.ChromeSwitches;
 import org.chromium.chrome.browser.vr.rules.ArPlaybackFile;
@@ -82,7 +81,6 @@ public class WebXrArHitTestTest {
      */
     @Test
     @MediumTest
-    @DisabledTest(message = "https://crbug.com/1112773")
     @XrActivityRestriction({XrActivityRestriction.SupportedActivity.ALL})
     @ArPlaybackFile("chrome/test/data/xr/ar_playback_datasets/floor_session_12s_30fps.mp4")
     public void testHitTestResultsAvailableInSubsequentFrame() {