v8binding: Makes Location's wrapper objects alive, really.

third_party/WebKit/Source/core/frame/DOMWindow.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/frame/DOMWindow.h"
 
 #include <memory>
 
 #include "bindings/core/v8/WindowProxyManager.h"
 #include "core/dom/Document.h"
@@ skipping 16 matching lines @@
 #include "core/probe/CoreProbes.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "platform/weborigin/Suborigin.h"
 
 namespace blink {
 
 DOMWindow::DOMWindow(Frame& frame)
     : frame_(frame),
       window_proxy_manager_(frame.GetWindowProxyManager()),
+      location_(this, nullptr),
       window_is_closing_(false) {}
 
 DOMWindow::~DOMWindow() {
   // The frame must be disconnected before finalization.
   DCHECK(!frame_);
 
   // Because the wrapper object of a DOMWindow is the global proxy, which may
   // live much longer than the DOMWindow, we need to dissociate all wrappers
   // for this instance.
   DOMWrapperWorld::DissociateDOMWindowWrappersInAllWorlds(this);
@@ skipping 411 matching lines @@
 }
 
 DEFINE_TRACE(DOMWindow) {
   visitor->Trace(frame_);
   visitor->Trace(window_proxy_manager_);
   visitor->Trace(input_capabilities_);
   visitor->Trace(location_);
   EventTargetWithInlineData::Trace(visitor);
 }
 
+DEFINE_TRACE_WRAPPERS(DOMWindow) {
+  visitor->TraceWrappers(location_);
+  EventTargetWithInlineData::TraceWrappers(visitor);
+}
+
 }  // namespace blink