Sheriff: re-disable flaky test that got re-enabled.

It was re-enabled as part of:
https://chromium-review.googlesource.com/c/chromium/src/+/1342764

Bug: 898370
Change-Id: Icd0e3ff7f4cf953e563d8182394aa7fb159911ac
TBR: kylixrd@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1349475
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610675}
diff --git a/chrome/browser/ui/browser_browsertest.cc b/chrome/browser/ui/browser_browsertest.cc
index 82e49c2..9d52c42 100644
--- a/chrome/browser/ui/browser_browsertest.cc
+++ b/chrome/browser/ui/browser_browsertest.cc
@@ -736,7 +736,7 @@
 // Test for crbug.com/22004.  Reloading a page with a before unload handler and
 // then canceling the dialog should not leave the throbber spinning.
 // https://crbug.com/898370: Test is flakily timing out
-IN_PROC_BROWSER_TEST_F(BrowserTest, ReloadThenCancelBeforeUnload) {
+IN_PROC_BROWSER_TEST_F(BrowserTest, DISABLED_ReloadThenCancelBeforeUnload) {
   GURL url(std::string("data:text/html,") + kBeforeUnloadHTML);
   ui_test_utils::NavigateToURL(browser(), url);
   WebContents* contents = browser()->tab_strip_model()->GetActiveWebContents();