bug 873939 followup - remove duplicates in the test_interfaces.html list. r=khuey

dom/tests/mochitest/general/test_interfaces.html

@@ -121,8 +121,6 @@ var interfaceNamesInGlobalScope =
     "EventListenerInfo",
     "EventSource",
     "EventTarget",
-    "EventTarget",
-    "File",
     "File",
     "FileHandle",
     "FileList",
@@ -254,7 +252,6 @@ var interfaceNamesInGlobalScope =
     "MozApplicationEvent",
     "MozBlobBuilder",
     "MozBrowserFrame",
-    "MozBrowserFrame",
     "MozCanvasPrintState",
     "MozConnection",
     "MozContactChangeEvent",
@@ -335,7 +332,6 @@ var interfaceNamesInGlobalScope =
     "RTCPeerConnection",
     "RTCSessionDescription",
     "Screen",
-    "Screen",
     "ScrollAreaEvent",
     "Selection",
     "Serializer",
@@ -505,7 +501,6 @@ var interfaceNamesInGlobalScope =
     "UIEvent",
     "UndoManager",
     "URL",
-    "URL",
     "UserDataHandler",
     "UserProximityEvent",
     "USSDReceivedEvent",