diff --git a/mozilla/js/src/jsfun.c b/mozilla/js/src/jsfun.c
index 96eb773c43a..eac23e92c5e 100644
--- a/mozilla/js/src/jsfun.c
+++ b/mozilla/js/src/jsfun.c
@@ -546,10 +546,8 @@ args_or_call_trace(JSTracer *trc, JSObject *obj)
     JSStackFrame *fp;
 
     fp = (JSStackFrame *) JS_GetPrivate(trc->context, obj);
-    if (fp && (fp->flags & JSFRAME_GENERATOR)) {
-        JS_CALL_OBJECT_TRACER(trc, FRAME_TO_GENERATOR(fp)->obj,
-                              "FRAME_TO_GENERATOR(fp)->obj");
-    }
+    if (fp && (fp->flags & JSFRAME_GENERATOR))
+        js_TraceGenerator(trc, FRAME_TO_GENERATOR(fp));
 }
 #else
 # define args_or_call_trace NULL
diff --git a/mozilla/js/src/jsiter.c b/mozilla/js/src/jsiter.c
index 987e9cab465..bab8a6d3384 100644
--- a/mozilla/js/src/jsiter.c
+++ b/mozilla/js/src/jsiter.c
@@ -670,23 +670,29 @@ generator_finalize(JSContext *cx, JSObject *obj)
     }
 }
 
+void
+js_TraceGenerator(JSTracer *trc, JSGenerator *gen)
+{
+    /*
+     * We must trace argv[-2], as js_TraceStackFrame will not. Note that
+     * js_TraceStackFrame will trace thisp (argv[-1]) and actual arguments,
+     * plus any missing formals and local GC roots.
+     */
+    JS_ASSERT(!JSVAL_IS_PRIMITIVE(gen->frame.argv[-2]));
+    JS_CALL_OBJECT_TRACER(trc, JSVAL_TO_OBJECT(gen->frame.argv[-2]),
+                          "generator");
+    js_TraceStackFrame(trc, &gen->frame);
+}
+
+
 static void
 generator_trace(JSTracer *trc, JSObject *obj)
 {
     JSGenerator *gen;
 
     gen = (JSGenerator *) JS_GetPrivate(trc->context, obj);
-    if (gen) {
-        /*
-         * We must trace argv[-2], as js_TraceStackFrame will not.  Note
-         * that js_TraceStackFrame will trace thisp (argv[-1]) and actual
-         * arguments, plus any missing formals and local GC roots.
-         */
-        JS_ASSERT(!JSVAL_IS_PRIMITIVE(gen->frame.argv[-2]));
-        JS_CALL_OBJECT_TRACER(trc, JSVAL_TO_OBJECT(gen->frame.argv[-2]),
-                              "generator");
-        js_TraceStackFrame(trc, &gen->frame);
-    }
+    if (gen)
+        js_TraceGenerator(trc, gen);
 }
 
 JSClass js_GeneratorClass = {
@@ -733,8 +739,6 @@ js_NewGenerator(JSContext *cx, JSStackFrame *fp)
     if (!gen)
         goto bad;
 
-    gen->obj = obj;
-
     /* Steal away objects reflecting fp and point them at gen->frame. */
     gen->frame.callobj = fp->callobj;
     if (fp->callobj) {
diff --git a/mozilla/js/src/jsiter.h b/mozilla/js/src/jsiter.h
index 9325107a6c0..497e317be27 100644
--- a/mozilla/js/src/jsiter.h
+++ b/mozilla/js/src/jsiter.h
@@ -91,8 +91,6 @@ typedef enum JSGeneratorState {
 } JSGeneratorState;
 
 struct JSGenerator {
-    JSGenerator         *next;
-    JSObject            *obj;
     JSGeneratorState    state;
     JSStackFrame        frame;
     JSArena             arena;
@@ -105,6 +103,9 @@ struct JSGenerator {
 extern JSObject *
 js_NewGenerator(JSContext *cx, JSStackFrame *fp);
 
+extern void
+js_TraceGenerator(JSTracer *trc, JSGenerator *gen);
+
 #endif
 
 extern JSClass          js_GeneratorClass;