Bug 1330699 part 5. Disallow mozmap-typed constants. r=qdot

dom/bindings/parser/WebIDL.py

@@ -3884,6 +3884,9 @@ class IDLConst(IDLInterfaceMember):
         if type.isDictionary():
             raise WebIDLError("A constant cannot be of a dictionary type",
                               [self.location])
+        if type.isMozMap():
+            raise WebIDLError("A constant cannot be of a MozMap type",
+                              [self.location])
         self.type = type
         self.value = value