Disable DevToolsBeforeUnloadTest.TestWorkerWindowClosing

The test is flaky.

Bug: 1100888
TBR=caseq@chromium.org
Change-Id: Ie7e0f3ced487e9b75cd78b52ce42aece547cb399

Change-Id: Ieb252751cdddf7c5715820f3e339c3a841843c50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2277116Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784503}

chrome/browser/devtools/devtools_sanity_browsertest.cc

@@ -762,8 +762,9 @@ IN_PROC_BROWSER_TEST_F(DevToolsBeforeUnloadTest,
 
 // Tests that closing worker inspector window does not cause browser crash
 // @see http://crbug.com/323031
+// TODO(https://crbug.com/1100888): Disabled due to flakiness.
 IN_PROC_BROWSER_TEST_F(DevToolsBeforeUnloadTest,
-                       TestWorkerWindowClosing) {
+                       DISABLED_TestWorkerWindowClosing) {
   ASSERT_TRUE(spawned_test_server()->Start());
   LoadTestPage(kDebuggerTestPage);
   DevToolsWindow* devtools_window = OpenDevToolWindowOnWebContents(