[Sheriff] Disable SitePerProcessInteractiveBrowserTest.RenderWidgetHostDeletedWhileMouseLocked.

This test is flaky on multiple builders. And I cannot find a CL that
look suspecious. Disable this test for now.

BUG=1059632
TBR=nasko@chromium.org

Change-Id: I19c7a021f526833a5187f17361c4b07d88f77a82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094518Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748106}

chrome/browser/site_isolation/site_per_process_interactive_browsertest.cc

@@ -1104,8 +1104,10 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessInteractiveBrowserTest,
 
 // Test that deleting a RenderWidgetHost that holds the mouse lock won't cause a
 // crash. https://crbug.com/619571.
+
+// Flaky on multiple builders. https://crbug.com/1059632
 IN_PROC_BROWSER_TEST_F(SitePerProcessInteractiveBrowserTest,
-                       RenderWidgetHostDeletedWhileMouseLocked) {
+                       DISABLED_RenderWidgetHostDeletedWhileMouseLocked) {
   GURL main_url(embedded_test_server()->GetURL(
       "a.com", "/cross_site_iframe_factory.html?a(b)"));
   ui_test_utils::NavigateToURL(browser(), main_url);