Disable failing tests on Mac 10.10 and 10.11 after swarming.

chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa_unittest.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #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"
 
 @interface ScreenCaptureNotificationController (ExposedForTesting)
 - (NSButton*)stopButton;
 - (NSButton*)minimizeButton;
 @end
 
 @implementation ScreenCaptureNotificationController (ExposedForTesting)
@@ skipping 87 matching lines @@
   target_->OnStarted(
       base::Bind(&ScreenCaptureNotificationUICocoaTest::StopCallback,
                  base::Unretained(this)));
 
   [[controller() window] close];
 
   EXPECT_EQ(1, callback_called_);
 }
 
 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(
       base::Bind(&ScreenCaptureNotificationUICocoaTest::StopCallback,
                  base::Unretained(this)));
 
   [[controller() minimizeButton] performClick:nil];
 
   EXPECT_EQ(0, callback_called_);
   EXPECT_TRUE([[controller() window] isMiniaturized]);
 }