Bug 1405552 - Do not expose FileReaderSync to serviceworkers, to match the spec; r=baku,bkelly

MozReview-Commit-ID: 1EJbrt8TXiq

--HG--
extra : rebase_source : 0559794bbdc1736f67bcee416001d2f56779b542

dom/serviceworkers/test/test_serviceworker_interfaces.js

@@ -128,8 +128,6 @@ var interfaceNamesInGlobalScope =
     "FileList",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "FileReader",
-// IMPORTANT: Do not change this list without review from a DOM peer!
-    "FileReaderSync",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "FormData",
 // IMPORTANT: Do not change this list without review from a DOM peer!

dom/webidl/FileReaderSync.webidl

@@ -11,7 +11,7 @@
  */
 
 [Constructor,
- Exposed=Worker]
+ Exposed=(DedicatedWorker,SharedWorker)]
 interface FileReaderSync {
 
   // Synchronously return strings

testing/web-platform/meta/FileAPI/historical.https.html.ini

@@ -1,4 +0,0 @@
-[historical.https.html]
-  ["FileReaderSync" should not be supported in service workers]
-    expected: FAIL
-