mac: Remove IsOSSnowLeopard().

ui/views/widget/native_widget_mac_interactive_uitest.mm

Index: ui/views/widget/native_widget_mac_interactive_uitest.mm
diff --git a/ui/views/widget/native_widget_mac_interactive_uitest.mm b/ui/views/widget/native_widget_mac_interactive_uitest.mm
index e8537ab9522e29750d5557222902f0f0418fc5f3..528f67d42a7d57fb9c36a87eb9bcecf0396828f5 100644
--- a/ui/views/widget/native_widget_mac_interactive_uitest.mm
+++ b/ui/views/widget/native_widget_mac_interactive_uitest.mm
@@ -164,10 +164,6 @@ NSData* ViewAsTIFF(NSView* view) {
 // Test that parent windows keep their traffic lights enabled when showing
 // dialogs.
 TEST_F(NativeWidgetMacInteractiveUITest, ParentWindowTrafficLights) {
-  // Snow leopard doesn't have -[NSWindow _sharesParentKeyState].
-  if (base::mac::IsOSSnowLeopard())
-    return;
-
   Widget* parent_widget = CreateTopLevelPlatformWidget();
   parent_widget->SetBounds(gfx::Rect(100, 100, 100, 100));
   ShowKeyWindow(parent_widget);