Disable SitePerProcessHitTestBrowserTest.SurfaceHitTestPointerEventsNoneChanged

The test is flaky on multiple platforms.

TBR=yigu@chromium.org

Bug: 968970
Change-Id: I52258bf986f6a6517fa2545eb528dcc40ae2891e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769439Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690299}

content/browser/site_per_process_hit_test_browsertest.cc

@@ -2718,8 +2718,9 @@ IN_PROC_BROWSER_TEST_P(SitePerProcessHitTestBrowserTest,
 
 // This test tests that browser process hittesting ignores frames with
 // pointer-events: none.
+// crbug.com/968970: the test is flaky.
 IN_PROC_BROWSER_TEST_P(SitePerProcessHitTestBrowserTest,
-                       SurfaceHitTestPointerEventsNoneChanged) {
+                       DISABLED_SurfaceHitTestPointerEventsNoneChanged) {
   GURL main_url(embedded_test_server()->GetURL(
       "/frame_tree/page_with_positioned_frame_pointer-events_none.html"));
   EXPECT_TRUE(NavigateToURL(shell(), main_url));