Disable flaky SameDocumentNavigationToHttpPortZero on Chrome OS

See https://crbug.com/1138540

TBR=lukasza@chromium.org

Bug: 1138540
Change-Id: I9c4aed146fce8642bb98e63aa8dd4b7c55b668cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2472580Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817133}

content/browser/renderer_host/navigation_controller_impl_browsertest.cc

@@ -10740,8 +10740,16 @@ IN_PROC_BROWSER_TEST_P(NavigationControllerBrowserTestNoServer,
 // 2) same-document
 // 3) to a http URL with port 0.
 // This is the scenario behind https://crbug.com/1065532.
+// TODO(crbug.com/1138540): Flaky on Chrome OS.
+#if defined(OS_CHROMEOS)
+#define MAYBE_SameDocumentNavigationToHttpPortZero \
+  DISABLED_SameDocumentNavigationToHttpPortZero
+#else
+#define MAYBE_SameDocumentNavigationToHttpPortZero \
+  SameDocumentNavigationToHttpPortZero
+#endif
 IN_PROC_BROWSER_TEST_P(NavigationControllerBrowserTest,
-                       SameDocumentNavigationToHttpPortZero) {
+                       MAYBE_SameDocumentNavigationToHttpPortZero) {
   // TODO(https://crbug.com/1100745): Remove this when test passes.
   if (ShouldCreateNewHostForSameSiteSubframe())
     return;