MacViews: Implement CloseNow() as just -[NSWindow close].

ui/views/widget/native_widget_mac_unittest.mm

Index: ui/views/widget/native_widget_mac_unittest.mm
diff --git a/ui/views/widget/native_widget_mac_unittest.mm b/ui/views/widget/native_widget_mac_unittest.mm
index 0dec9ded50095c597488f9b4f621fe55f2e16cf5..6c9e042e23065d9e68357041020528bfd0ba97e4 100644
--- a/ui/views/widget/native_widget_mac_unittest.mm
+++ b/ui/views/widget/native_widget_mac_unittest.mm
@@ -1157,7 +1157,7 @@ class ParentCloseMonitor : public WidgetObserver {
     // Upon a parent-triggered close, the NSWindow relationship will already be
     // removed. The parent should still be open (children are always closed

[karandeepb, 2016/10/18 10:00:29]

"the NSWindow relation will already be removed". Update this comment.

[tapted, 2016/10/19 06:20:25]

Done. And actually added a OnWidgetDestroyed() override as well, so we can check
the old condition as well.

     // first), but not have a delegate (since it is being torn down).
-    EXPECT_FALSE([child->GetNativeWindow() parentWindow]);
+    EXPECT_TRUE([child->GetNativeWindow() parentWindow]);
     EXPECT_TRUE([parent_nswindow_ isVisible]);
     EXPECT_FALSE([parent_nswindow_ delegate]);