Disable WebContentsViewAuraTest.VerticalOverscroll on ChromeOS

content/browser/web_contents/web_contents_view_aura_browsertest.cc

Index: content/browser/web_contents/web_contents_view_aura_browsertest.cc
diff --git a/content/browser/web_contents/web_contents_view_aura_browsertest.cc b/content/browser/web_contents/web_contents_view_aura_browsertest.cc
index fd4e3167a83c532eb0b917150d8af25b9d306813..88785e40412260eace366f13d59ea528f1d17865 100644
--- a/content/browser/web_contents/web_contents_view_aura_browsertest.cc
+++ b/content/browser/web_contents/web_contents_view_aura_browsertest.cc
@@ -1003,8 +1003,8 @@ IN_PROC_BROWSER_TEST_F(WebContentsViewAuraTest,
 }
 
 // Test that vertical overscroll updates are sent only when a user overscrolls
-// vertically.
-#if defined(OS_WIN)
+// vertically. Flaky on several platforms. https://crbug.com/679420
+#if defined(OS_WIN) || defined(OS_CHROMEOS)
 #define MAYBE_VerticalOverscroll DISABLED_VerticalOverscroll
 #else
 #define MAYBE_VerticalOverscroll VerticalOverscroll