Bug 1363982 followup, mark service-workers/service-worker/fetch-event.https.html as failing on OS X debug too, a=merged-around-bustage

MozReview-Commit-ID: HabH9MeqhSN

testing/web-platform/meta/service-workers/service-worker/fetch-event.https.html.ini

@@ -9,6 +9,7 @@
       if not debug and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): FAIL
       if debug and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
+      if debug and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): FAIL
       if not debug and e10s and (os == "win") and (version == "6.2.9200") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and e10s and (os == "win") and (version == "6.2.9200") and (processor == "x86_64") and (bits == 64): FAIL