import change from rmottola/Arctic-Fox:

- further pointer style tweak for patching (90943bf7a)
- Bug 1137910 part 1. Don't lose track of the original 'this' object in THIS_SAVEDFRAME, so we can actually do things based on the principal of the object we're working with. (0c6bf89dc)
- Bug 1137910 part 2. Give chrome callers that are indirectly (e.g. via nsIStackFrame) poking at content-captured stacks the content view of the stack. (9b9d8981d)
- more pointer style to pach easier (210ef0c78)
- even more pointer style (8dad567c6)
- Bug 1130576 - Rename JSPropertyOp -> JSGetterOp and JSStrictPropertyOp -> JSSetterOp. (0714aa290)
- Bug 1083359 - Part 1 - Add the asyncCause and asyncParent properties to the native SavedFrame object. (1c99ec1bc)
- more pointerstyle (21148a28d)
- Bug 1135827 - Don't root more times than necessary in js::SavedStacks::insertFrames. (904461ae0)
- comment fix (9401372c6)
- Bug 1083359 - Part 2 - Allow C++ code to provide an async stack when calling a JS function. (e5ce833fa)
- Bug 1133081, part 1 - Switch from js::PropDesc to JSPropertyDescriptor for all users of js::StandardDefineProperty (mainly Object.defineProperty/Properties and the corresponding Debugger.Object methods). (4754703df)
- pointer style (58e1befc2)
- Bug 1133094 - Object.defineProperty() on scripted proxy incorrectly sets {[[Configurable]]: true} if it's missing. (c4da7e6c6)
- Bug 1133081, part 2 - Switch from js::PropDesc to JSPropertyDescriptor for js::StandardDefineProperty implementation. (07efac725)
- Bug 1133081, part 3 - Switch from js::PropDesc to JSPropertyDescriptor for more odds and ends. (119b5711e)
- more pointer style (b2c2a8383)
- Bug 1133294 - Object.getOwnPropertyDescriptor(obj, key) must always return either undefined or a complete property descriptor, even if obj is a proxy. (39bc723a7)
- Bug 1133081, part 4 - Reimplement the remaining PropDesc methods and delete PropDesc. (3b447fb7b)
- Bug 1130537 - Reimplement js::SetPropertyIgnoringNamedGetter to follow ES6 draft rev 32 9.1.9 [[Set]]. (7a681465a)

dom/bindings/DOMJSProxyHandler.cpp

@@ -243,7 +243,6 @@ DOMProxyHandler::set(JSContext *cx, Handle<JSObject*> proxy, Handle<JSObject*> r
                             &desc)) {
     return false;
   }
-  bool descIsOwn = desc.object() != nullptr;
   if (!desc.object()) {
     // Don't just use getPropertyDescriptor, unlike BaseProxyHandler::set,
     // because that would call getOwnPropertyDescriptor on ourselves.  Instead,
@@ -257,8 +256,7 @@ DOMProxyHandler::set(JSContext *cx, Handle<JSObject*> proxy, Handle<JSObject*> r
     }
   }
 
-  return js::SetPropertyIgnoringNamedGetter(cx, this, proxy, receiver, id,
-                                            &desc, descIsOwn, vp, result);
+  return js::SetPropertyIgnoringNamedGetter(cx, proxy, id, vp, receiver, &desc, result);
 }
 
 bool