Revert "Re-enable WebVrTest#testPoseDataUnfocusedTab"

This reverts commit eb03fb79.

Reason for revert: Test is still flaky after all.

Original change's description:
> Re-enable WebVrTest#testPoseDataUnfocusedTab
> 
> Re-enables the previously flaky WebVrTest#testPoseDataUnfocusedTab.
> Flakiness appears to have been caused by the move to JUnit4 and fixed
> in one of the CLs that did additional cleanup and improvements after the move.
> 
> Bug: 726986
> Change-Id: I6e54b87e21eaed91ac668125857c09e6df4b46e2
> Reviewed-on: https://chromium-review.googlesource.com/521842
> Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
> Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#476409}

TBR=mthiesse@chromium.org,bsheedy@chromium.org
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 726986

Change-Id: Iecf5abe7ab0f1d27dcb149ca53f480f758de7be3
Reviewed-on: https://chromium-review.googlesource.com/522182
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#476498}

chrome/android/javatests/src/org/chromium/chrome/browser/vr_shell/WebVrTest.java

@@ -23,6 +23,7 @@ import org.junit.runner.RunWith;
 
 import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.DisableIf;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.MinAndroidSdkLevel;
 import org.chromium.base.test.util.Restriction;
 import org.chromium.chrome.R;
@@ -161,7 +162,8 @@ public class WebVrTest {
      * Tests that non-focused tabs cannot get pose information.
      */
     @Test
-    @SmallTest
+    // @SmallTest
+    @DisabledTest(message = "Flaky. http://crbug.com/726986")
     public void testPoseDataUnfocusedTab() throws InterruptedException {
         mVrTestRule.loadUrlAndAwaitInitialization(
                 VrTestRule.getHtmlTestFile("test_pose_data_unfocused_tab"), PAGE_LOAD_TIMEOUT_S);