diff --git a/js/src/builtin/TypedObject.cpp b/js/src/builtin/TypedObject.cpp
index 593f070874e3..35f72a089d0b 100644
--- a/js/src/builtin/TypedObject.cpp
+++ b/js/src/builtin/TypedObject.cpp
@@ -2084,7 +2084,7 @@ TypedObject::obj_deleteGeneric(JSContext *cx, HandleObject obj, HandleId id, boo
         return true;
     }
 
-    return JSObject::deleteGeneric(cx, proto, id, succeeded);
+    return DeleteProperty(cx, proto, id, succeeded);
 }
 
 bool
diff --git a/js/src/jsapi.cpp b/js/src/jsapi.cpp
index 95e74730665a..79253f800c20 100644
--- a/js/src/jsapi.cpp
+++ b/js/src/jsapi.cpp
@@ -3178,7 +3178,7 @@ JS_DeletePropertyById2(JSContext *cx, HandleObject obj, HandleId id, bool *resul
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, id);
 
-    return JSObject::deleteGeneric(cx, obj, id, result);
+    return DeleteProperty(cx, obj, id, result);
 }
 
 JS_PUBLIC_API(bool)
@@ -3188,7 +3188,7 @@ JS_DeleteElement2(JSContext *cx, HandleObject obj, uint32_t index, bool *result)
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
 
-    return JSObject::deleteElement(cx, obj, index, result);
+    return DeleteElement(cx, obj, index, result);
 }
 
 JS_PUBLIC_API(bool)
@@ -3201,7 +3201,7 @@ JS_DeleteProperty2(JSContext *cx, HandleObject obj, const char *name, bool *resu
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
-    return JSObject::deleteGeneric(cx, obj, id, result);
+    return DeleteProperty(cx, obj, id, result);
 }
 
 JS_PUBLIC_API(bool)
@@ -3215,7 +3215,7 @@ JS_DeleteUCProperty2(JSContext *cx, HandleObject obj, const char16_t *name, size
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
-    return JSObject::deleteGeneric(cx, obj, id, result);
+    return DeleteProperty(cx, obj, id, result);
 }
 
 JS_PUBLIC_API(bool)
diff --git a/js/src/jsarray.cpp b/js/src/jsarray.cpp
index 31ab869439c2..638ce5d26938 100644
--- a/js/src/jsarray.cpp
+++ b/js/src/jsarray.cpp
@@ -410,7 +410,7 @@ DeleteArrayElement(JSContext *cx, HandleObject obj, double index, bool *succeede
     RootedId id(cx);
     if (!ToId(cx, index, &id))
         return false;
-    return JSObject::deleteGeneric(cx, obj, id, succeeded);
+    return DeleteProperty(cx, obj, id, succeeded);
 }
 
 /* ES6 20130308 draft 9.3.5 */
@@ -628,7 +628,7 @@ js::ArraySetLength(JSContext *cx, Handle<ArrayObject*> arr, HandleId id,
 
                 /* Steps 15b-d. */
                 bool deleteSucceeded;
-                if (!JSObject::deleteElement(cx, arr, oldLen, &deleteSucceeded))
+                if (!DeleteElement(cx, arr, oldLen, &deleteSucceeded))
                     return false;
                 if (!deleteSucceeded) {
                     newLen = oldLen + 1;
@@ -688,7 +688,7 @@ js::ArraySetLength(JSContext *cx, Handle<ArrayObject*> arr, HandleId id,
 
                 /* Steps 15b-d. */
                 bool deleteSucceeded;
-                if (!JSObject::deleteElement(cx, arr, index, &deleteSucceeded))
+                if (!DeleteElement(cx, arr, index, &deleteSucceeded))
                     return false;
                 if (!deleteSucceeded) {
                     newLen = index + 1;
diff --git a/js/src/jsobj.cpp b/js/src/jsobj.cpp
index 10166ae512db..0bac50951d21 100644
--- a/js/src/jsobj.cpp
+++ b/js/src/jsobj.cpp
@@ -2498,7 +2498,7 @@ bad:
     if (named) {
         bool succeeded;
         RootedId id(cx, AtomToId(atom));
-        JSObject::deleteGeneric(cx, obj, id, &succeeded);
+        DeleteProperty(cx, obj, id, &succeeded);
     }
     if (cached)
         ClearClassObject(obj, key);
diff --git a/js/src/jsobj.h b/js/src/jsobj.h
index 8c7b32b544e0..7ae524dacdc7 100644
--- a/js/src/jsobj.h
+++ b/js/src/jsobj.h
@@ -573,11 +573,6 @@ class JSObject : public js::gc::Cell
     static inline bool setGenericAttributes(JSContext *cx, js::HandleObject obj,
                                             js::HandleId id, unsigned *attrsp);
 
-    static inline bool deleteGeneric(JSContext *cx, js::HandleObject obj, js::HandleId id,
-                                     bool *succeeded);
-    static inline bool deleteElement(JSContext *cx, js::HandleObject obj, uint32_t index,
-                                     bool *succeeded);
-
     static inline bool watch(JSContext *cx, JS::HandleObject obj, JS::HandleId id,
                              JS::HandleObject callable);
     static inline bool unwatch(JSContext *cx, JS::HandleObject obj, JS::HandleId id);
@@ -978,6 +973,15 @@ inline bool
 SetElement(JSContext *cx, HandleObject obj, HandleObject receiver, uint32_t index,
            MutableHandleValue vp, bool strict);
 
+/*
+ * ES6 [[Delete]]. Equivalent to the JS code `delete obj[id]`.
+ */
+inline bool
+DeleteProperty(JSContext *cx, js::HandleObject obj, js::HandleId id, bool *succeeded);
+
+inline bool
+DeleteElement(JSContext *cx, js::HandleObject obj, uint32_t index, bool *succeeded);
+
 
 /*** SpiderMonkey nonstandard internal methods ***************************************************/
 
diff --git a/js/src/jsobjinlines.h b/js/src/jsobjinlines.h
index b889dd5f5ea7..3c4f1849fb56 100644
--- a/js/src/jsobjinlines.h
+++ b/js/src/jsobjinlines.h
@@ -35,26 +35,6 @@ JSObject::setGenericAttributes(JSContext *cx, js::HandleObject obj,
     return js::NativeSetPropertyAttributes(cx, obj.as<js::NativeObject>(), id, attrsp);
 }
 
-/* static */ inline bool
-JSObject::deleteGeneric(JSContext *cx, js::HandleObject obj, js::HandleId id,
-                         bool *succeeded)
-{
-    js::types::MarkTypePropertyNonData(cx, obj, id);
-    js::DeleteGenericOp op = obj->getOps()->deleteGeneric;
-    if (op)
-        return op(cx, obj, id, succeeded);
-    return js::NativeDeleteProperty(cx, obj.as<js::NativeObject>(), id, succeeded);
-}
-
-/* static */ inline bool
-JSObject::deleteElement(JSContext *cx, js::HandleObject obj, uint32_t index, bool *succeeded)
-{
-    JS::RootedId id(cx);
-    if (!js::IndexToId(cx, index, &id))
-        return false;
-    return deleteGeneric(cx, obj, id, succeeded);
-}
-
 /* static */ inline bool
 JSObject::watch(JSContext *cx, JS::HandleObject obj, JS::HandleId id,
                 JS::HandleObject callable)
@@ -236,6 +216,24 @@ js::GetElementNoGC(JSContext *cx, JSObject *obj, JSObject *receiver, uint32_t in
     return GetPropertyNoGC(cx, obj, receiver, INT_TO_JSID(index), vp);
 }
 
+inline bool
+js::DeleteProperty(JSContext *cx, HandleObject obj, HandleId id, bool *succeeded)
+{
+    types::MarkTypePropertyNonData(cx, obj, id);
+    if (DeleteGenericOp op = obj->getOps()->deleteGeneric)
+        return op(cx, obj, id, succeeded);
+    return NativeDeleteProperty(cx, obj.as<NativeObject>(), id, succeeded);
+}
+
+inline bool
+js::DeleteElement(JSContext *cx, HandleObject obj, uint32_t index, bool *succeeded)
+{
+    RootedId id(cx);
+    if (!IndexToId(cx, index, &id))
+        return false;
+    return DeleteProperty(cx, obj, id, succeeded);
+}
+
 
 /* * */
 
diff --git a/js/src/json.cpp b/js/src/json.cpp
index 019e58bd1254..479bbd52741b 100644
--- a/js/src/json.cpp
+++ b/js/src/json.cpp
@@ -712,7 +712,7 @@ Walk(JSContext *cx, HandleObject holder, HandleId name, HandleValue reviver, Mut
                 if (newElement.isUndefined()) {
                     /* Step 2a(iii)(2). */
                     bool succeeded;
-                    if (!JSObject::deleteGeneric(cx, obj, id, &succeeded))
+                    if (!DeleteProperty(cx, obj, id, &succeeded))
                         return false;
                 } else {
                     /* Step 2a(iii)(3). */
@@ -740,7 +740,7 @@ Walk(JSContext *cx, HandleObject holder, HandleId name, HandleValue reviver, Mut
                 if (newElement.isUndefined()) {
                     /* Step 2b(ii)(2). */
                     bool succeeded;
-                    if (!JSObject::deleteGeneric(cx, obj, id, &succeeded))
+                    if (!DeleteProperty(cx, obj, id, &succeeded))
                         return false;
                 } else {
                     /* Step 2b(ii)(3). */
diff --git a/js/src/proxy/DirectProxyHandler.cpp b/js/src/proxy/DirectProxyHandler.cpp
index 05d310cec7db..f48a66bdf22c 100644
--- a/js/src/proxy/DirectProxyHandler.cpp
+++ b/js/src/proxy/DirectProxyHandler.cpp
@@ -59,7 +59,7 @@ DirectProxyHandler::delete_(JSContext *cx, HandleObject proxy, HandleId id, bool
 {
     assertEnteredPolicy(cx, proxy, id, SET);
     RootedObject target(cx, proxy->as<ProxyObject>().target());
-    return JSObject::deleteGeneric(cx, target, id, bp);
+    return DeleteProperty(cx, target, id, bp);
 }
 
 bool
diff --git a/js/src/vm/Debugger.cpp b/js/src/vm/Debugger.cpp
index 78449018f714..ac05a2216c43 100644
--- a/js/src/vm/Debugger.cpp
+++ b/js/src/vm/Debugger.cpp
@@ -6702,7 +6702,7 @@ DebuggerObject_deleteProperty(JSContext *cx, unsigned argc, Value *vp)
     ErrorCopier ec(ac);
 
     bool succeeded;
-    if (!JSObject::deleteGeneric(cx, obj, id, &succeeded))
+    if (!DeleteProperty(cx, obj, id, &succeeded))
         return false;
     args.rval().setBoolean(succeeded);
     return true;
diff --git a/js/src/vm/Interpreter.cpp b/js/src/vm/Interpreter.cpp
index b88a9db83075..d0d057d8f8c3 100644
--- a/js/src/vm/Interpreter.cpp
+++ b/js/src/vm/Interpreter.cpp
@@ -2287,7 +2287,7 @@ CASE(JSOP_STRICTDELPROP)
     FETCH_OBJECT(cx, -1, obj);
 
     bool succeeded;
-    if (!JSObject::deleteGeneric(cx, obj, id, &succeeded))
+    if (!DeleteProperty(cx, obj, id, &succeeded))
         goto error;
     if (!succeeded && JSOp(*REGS.pc) == JSOP_STRICTDELPROP) {
         obj->reportNotConfigurable(cx, id);
@@ -2314,7 +2314,7 @@ CASE(JSOP_STRICTDELELEM)
     RootedId &id = rootId0;
     if (!ValueToId<CanGC>(cx, propval, &id))
         goto error;
-    if (!JSObject::deleteGeneric(cx, obj, id, &succeeded))
+    if (!DeleteProperty(cx, obj, id, &succeeded))
         goto error;
     if (!succeeded && JSOp(*REGS.pc) == JSOP_STRICTDELELEM) {
         obj->reportNotConfigurable(cx, id);
@@ -3786,7 +3786,7 @@ js::DeleteProperty(JSContext *cx, HandleValue v, HandlePropertyName name, bool *
         return false;
 
     RootedId id(cx, NameToId(name));
-    if (!JSObject::deleteGeneric(cx, obj, id, bp))
+    if (!DeleteProperty(cx, obj, id, bp))
         return false;
 
     if (strict && !*bp) {
@@ -3810,7 +3810,7 @@ js::DeleteElement(JSContext *cx, HandleValue val, HandleValue index, bool *bp)
     RootedId id(cx);
     if (!ValueToId<CanGC>(cx, index, &id))
         return false;
-    if (!JSObject::deleteGeneric(cx, obj, id, bp))
+    if (!DeleteProperty(cx, obj, id, bp))
         return false;
 
     if (strict && !*bp) {
@@ -3922,7 +3922,7 @@ js::DeleteNameOperation(JSContext *cx, HandlePropertyName name, HandleObject sco
 
     bool succeeded;
     RootedId id(cx, NameToId(name));
-    if (!JSObject::deleteGeneric(cx, scope, id, &succeeded))
+    if (!DeleteProperty(cx, scope, id, &succeeded))
         return false;
     res.setBoolean(succeeded);
     return true;
diff --git a/js/src/vm/ScopeObject.cpp b/js/src/vm/ScopeObject.cpp
index b10c213e5612..37a746e57638 100644
--- a/js/src/vm/ScopeObject.cpp
+++ b/js/src/vm/ScopeObject.cpp
@@ -580,7 +580,7 @@ static bool
 with_DeleteGeneric(JSContext *cx, HandleObject obj, HandleId id, bool *succeeded)
 {
     RootedObject actual(cx, &obj->as<DynamicWithObject>().object());
-    return JSObject::deleteGeneric(cx, actual, id, succeeded);
+    return DeleteProperty(cx, actual, id, succeeded);
 }
 
 static JSObject *