Disable Quarantine tests on platforms its not supported.

content/public/common/quarantine.h

Index: content/public/common/quarantine.h
diff --git a/content/public/common/quarantine.h b/content/public/common/quarantine.h
index 5f28fb421ca5e7db2ef31c91b888f71efa446044..8295082f728b9fc30800204bd2753f28564346fe 100644
--- a/content/public/common/quarantine.h
+++ b/content/public/common/quarantine.h
@@ -101,6 +101,13 @@ 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_