Remove LeaveTrace and related structures (bug 698201 part 5, r=luke).

js/src/jsiter.cpp

@@ -369,7 +369,6 @@ GetCustomIterator(JSContext *cx, JSObject *obj, uintN flags, Value *vp)
         ++sCustomIteratorCount;
 
     /* Otherwise call it and return that object. */
-    LeaveTrace(cx);
     Value arg = BooleanValue((flags & JSITER_FOREACH) == 0);
     if (!Invoke(cx, ObjectValue(*obj), *vp, 1, &arg, vp))
         return false;
@@ -1396,8 +1395,6 @@ CloseGenerator(JSContext *cx, JSObject *obj)
 static JSBool
 generator_op(JSContext *cx, Native native, JSGeneratorOp op, Value *vp, uintN argc)
 {
-    LeaveTrace(cx);
-
     CallArgs args = CallArgsFromVp(argc, vp);
 
     bool ok;