MacViews: Gets a webview working in views_examples_with_content_exe

ui/message_center/views/message_popup_collection_unittest.cc

Index: ui/message_center/views/message_popup_collection_unittest.cc
diff --git a/ui/message_center/views/message_popup_collection_unittest.cc b/ui/message_center/views/message_popup_collection_unittest.cc
index 551e4dd3357e125c4aecbff86d70bb2268a02cff..1d1391c79584f5f041eda864f33c7539bc7b2a24 100644
--- a/ui/message_center/views/message_popup_collection_unittest.cc
+++ b/ui/message_center/views/message_popup_collection_unittest.cc
@@ -31,8 +31,16 @@ class MessagePopupCollectionTest : public views::ViewsTestBase {
     MessageCenter::Initialize();
     MessageCenter::Get()->DisableTimersForTest();
     alignment_delegate_.reset(new DesktopPopupAlignmentDelegate);
+
+    gfx::NativeView parent = NULL;
+#if defined(USE_ASH)
+    // On ChromeOS the parent is a special container window. In tests, provide
+    // the root window instead. Note on a Windows ash build the parent is later
+    // NULLed out, because the message center is managed in desktop mode only.
+    parent = GetContext();
+#endif
     collection_.reset(new MessagePopupCollection(
-        GetContext(), MessageCenter::Get(), NULL, alignment_delegate_.get()));
+        parent, MessageCenter::Get(), NULL, alignment_delegate_.get()));
     // This size fits test machines resolution and also can keep a few toasts
     // w/o ill effects of hitting the screen overflow. This allows us to assume
     // and verify normal layout of the toast stack.