[ios] Disables WindowLocationTest.WindowLocationSetToDOMString on device.

ios/web/navigation/window_location_inttest.mm

Index: ios/web/navigation/window_location_inttest.mm
diff --git a/ios/web/navigation/window_location_inttest.mm b/ios/web/navigation/window_location_inttest.mm
index 4637b9d1365681c636554ab97b04bb61ecdc038e..af3d7827eb000573436ed7972c8261a7a36b31d1 100644
--- a/ios/web/navigation/window_location_inttest.mm
+++ b/ios/web/navigation/window_location_inttest.mm
@@ -222,7 +222,14 @@ TEST_F(WindowLocationTest, MAYBE_WindowLocationReload) {
 }
 
 // Tests that calling window.location.assign() creates a new NavigationItem.
-TEST_F(WindowLocationTest, WindowLocationSetToDOMString) {
+#if TARGET_IPHONE_SIMULATOR
+#define MAYBE_WindowLocationSetToDOMString WindowLocationSetToDOMString
+#else
+#define MAYBE_WindowLocationSetToDOMString DISABLED_WindowLocationSetToDOMString
+#endif
+// TODO(crbug.com/731740): This test is disabled because it occasionally times
+// out on device.
+TEST_F(WindowLocationTest, MAYBE_WindowLocationSetToDOMString) {
   // Navigate to about:blank so there is a forward entry to prune.
   GURL about_blank("about:blank");
   LoadUrl(about_blank);