Disable Quarantine tests on platforms its not supported.

content/public/common/quarantine.h

 // Copyright 2016 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.
 
 #ifndef CONTENT_PUBLIC_COMMON_QUARANTINE_H_
 #define CONTENT_PUBLIC_COMMON_QUARANTINE_H_
 
 #include <string>
 
 #include "content/common/content_export.h"
@@ skipping 83 matching lines @@
 // If both |source_url| and |referrer_url|, then the funciton returns true if
 // any quarantine metadata is present for the file.
 //
 // **Note**: On Windows, this function only checks if the |ZoneIdentifier|
 // metadata is present. |source_url| and |referrer_url| are ignored. Windows
 // currently doesn't store individual URLs as part of the mark-of-the-web.
 CONTENT_EXPORT bool IsFileQuarantined(const base::FilePath& file,
                                       const GURL& source_url,
                                       const GURL& referrer_url);
 
+// Determine if quarantining is supported. For exapmle, quarantining would not
+// be supported on a linux system that disabled extended attributes or that uses
+// tmpfs.
+//
+// Only to be used in tests.
+CONTENT_EXPORT bool IsQuarantineSupportedForTesting();
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_QUARANTINE_H_