Disabled ChromeSitePerProcessTest.TabCloseWithCrossSiteBeforeUnloadIframe

TBR=alexmos@chromium.org

Bug: 1021895
Change-Id: I94ca6541149962bddcce3a9989c163930427501e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1901073Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712970}

chrome/browser/site_isolation/chrome_site_per_process_browsertest.cc

@@ -1605,10 +1605,18 @@ IN_PROC_BROWSER_TEST_F(ChromeSitePerProcessTest,
   EXPECT_FALSE(frame_c_popup_opened);
 }
 
+// Flaky on Linux and ChromeOS (crbug.com/1021895)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS)
+#define MAYBE_TabCloseWithCrossSiteBeforeUnloadIframe \
+  DISABLED_TabCloseWithCrossSiteBeforeUnloadIframe
+#else
+#define MAYBE_TabCloseWithCrossSiteBeforeUnloadIframe \
+  TabCloseWithCrossSiteBeforeUnloadIframe
+#endif
 // Tests that a cross-site iframe runs its beforeunload handler when closing a
 // tab.  See https://crbug.com/853021.
 IN_PROC_BROWSER_TEST_F(ChromeSitePerProcessTest,
-                       TabCloseWithCrossSiteBeforeUnloadIframe) {
+                       MAYBE_TabCloseWithCrossSiteBeforeUnloadIframe) {
   TabStripModel* tab_strip_model = browser()->tab_strip_model();
   content::WebContents* first_web_contents =
       tab_strip_model->GetActiveWebContents();