Bug 821580. Disallow [Unforgeable] on static attributes, per spec update. r=khuey

dom/bindings/parser/WebIDL.py

@@ -2142,6 +2142,9 @@ class IDLAttribute(IDLInterfaceMember):
             if not self.readonly:
                 raise WebIDLError("[Unforgeable] is only allowed on readonly "
                                   "attributes", [attr.location, self.location])
+            if self.isStatic():
+                raise WebIDLError("[Unforgeable] is only allowed on non-static "
+                                  "attributes", [attr.location, self.location])
             self._unforgeable = True
         elif identifier == "Constant" and not self.readonly:
             raise WebIDLError("[Constant] only allowed on readonly attributes",

dom/bindings/parser/tests/test_unforgeable.py

@@ -176,3 +176,18 @@ def WebIDLTest(parser, harness):
         threw = True
 
     harness.ok(threw, "Should have thrown for writable [Unforgeable] attribute.")
+
+    parser = parser.reset();
+    threw = False
+    try:
+        parser.parse("""
+            interface iface {
+              [Unforgeable] static readonly attribute long foo;
+            };
+        """)
+
+        results = parser.finish()
+    except:
+        threw = True
+
+    harness.ok(threw, "Should have thrown for static [Unforgeable] attribute.")