Disable flaky test WebViewFocusInteractiveTest.FocusAndVisibility.

This test is flaky on Linux, ChromeOS and Windows. This test was also
disabled on Mac for another reason, so this test is disabled on four
platforms in total.

TBR=jbroman@chromium.org

Bug: 845638, 811893
Change-Id: Iff963f4075c34dd3ecc27596ab6ac96489b80bce
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1070017Reviewed-by: Yuta Kitamura <yutak@chromium.org>
Commit-Queue: Yuta Kitamura <yutak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560985}

chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc

@@ -1601,8 +1601,10 @@ IN_PROC_BROWSER_TEST_F(WebViewInteractiveTest, WordLookup) {
 }
 #endif
 
-// Flaky on Mac - http://crbug.com/811893
-#if defined(OS_MACOSX)
+// Flaky on Mac: http://crbug.com/811893
+// Flaky on Linux/ChromeOS/Windows: http://crbug.com/845638
+#if defined(OS_MACOSX) || defined(OS_LINUX) || defined(OS_CHROMEOS) || \
+    defined(OS_WIN)
 #define MAYBE_FocusAndVisibility DISABLED_FocusAndVisibility
 #else
 #define MAYBE_FocusAndVisibility FocusAndVisibility