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

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

Index: third_party/WebKit/Source/core/frame/DOMWindow.cpp
diff --git a/third_party/WebKit/Source/core/frame/DOMWindow.cpp b/third_party/WebKit/Source/core/frame/DOMWindow.cpp
index 64c5d4e0c5a21d7aeca844ab1cc25b171e6180e1..b3ce2ee566fa7e336ee32eb886f915a99b2b740a 100644
--- a/third_party/WebKit/Source/core/frame/DOMWindow.cpp
+++ b/third_party/WebKit/Source/core/frame/DOMWindow.cpp
@@ -34,6 +34,7 @@ namespace blink {
 DOMWindow::DOMWindow(Frame& frame)
     : frame_(frame),
       window_proxy_manager_(frame.GetWindowProxyManager()),
+      location_(this, nullptr),
       window_is_closing_(false) {}
 
 DOMWindow::~DOMWindow() {
@@ -465,4 +466,9 @@ DEFINE_TRACE(DOMWindow) {
   EventTargetWithInlineData::Trace(visitor);
 }
 
+DEFINE_TRACE_WRAPPERS(DOMWindow) {
+  visitor->TraceWrappers(location_);
+  EventTargetWithInlineData::TraceWrappers(visitor);
+}
+
 }  // namespace blink