Disable failing tests on Mac 10.10 and 10.11 after swarming.

ui/views/widget/widget_unittest.cc

Index: ui/views/widget/widget_unittest.cc
diff --git a/ui/views/widget/widget_unittest.cc b/ui/views/widget/widget_unittest.cc
index f7b3e691bfab6f6472f7a3e1a961d6472db4745b..bc29c83d5c30d1eb4aff449e68ab8947972e4760 100644
--- a/ui/views/widget/widget_unittest.cc
+++ b/ui/views/widget/widget_unittest.cc
@@ -969,6 +969,11 @@ TEST_F(WidgetObserverTest, ClosingOnHiddenParent) {
 
 // Test behavior of NativeWidget*::GetWindowPlacement on the native desktop.
 TEST_F(WidgetTest, GetWindowPlacement) {
+#if defined(OS_MACOSX)
+  if (base::mac::IsOS10_10())
+    return;  // Fails when swarmed. http://crbug.com/660582
+#endif
+
   if (IsMus()) {
     NOTIMPLEMENTED();
     return;