Disable failing tests on Mac 10.10 and 10.11 after swarming.

chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa_unittest.mm

Index: chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa_unittest.mm
diff --git a/chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa_unittest.mm b/chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa_unittest.mm
index 8d08182969c26bc6f0a26149d72ab695b8b40336..4014b3b9cac07e56c843fb89c750889a335a2f6d 100644
--- a/chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa_unittest.mm
+++ b/chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa_unittest.mm
@@ -5,6 +5,7 @@
 #import "chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa.h"
 
 #include "base/bind.h"
+#include "base/mac/mac_util.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/cocoa/cocoa_test_helper.h"
@@ -112,6 +113,8 @@ TEST_F(ScreenCaptureNotificationUICocoaTest, CloseWindow) {
 }
 
 TEST_F(ScreenCaptureNotificationUICocoaTest, MinimizeWindow) {
+  if (base::mac::IsOS10_10())
+    return;  // Fails when swarmed. http://crbug.com/660582
   target_.reset(
       new ScreenCaptureNotificationUICocoa(base::UTF8ToUTF16("Title")));
   target_->OnStarted(