Don't retain NPNVWindowNPObject and NPNVPluginElementNPObject twice

content/plugin/webplugin_proxy.cc

Index: content/plugin/webplugin_proxy.cc
diff --git a/content/plugin/webplugin_proxy.cc b/content/plugin/webplugin_proxy.cc
index 5006b6cb6abf57a00cb70507a64e77478d869ef2..28c7247c51630a78e2207a97be04c2fe2f74262a 100644
--- a/content/plugin/webplugin_proxy.cc
+++ b/content/plugin/webplugin_proxy.cc
@@ -93,6 +93,11 @@ WebPluginProxy::~WebPluginProxy() {
   if (accelerated_surface_.get())
     accelerated_surface_.reset();
 #endif
+
+  if (plugin_element_)
+    WebBindings::releaseObject(plugin_element_);
+  if (window_npobject_)
+    WebBindings::releaseObject(window_npobject_);
 }
 
 bool WebPluginProxy::Send(IPC::Message* msg) {
@@ -190,7 +195,7 @@ void WebPluginProxy::InvalidateRect(const gfx::Rect& rect) {
 
 NPObject* WebPluginProxy::GetWindowScriptNPObject() {
   if (window_npobject_)
-    return WebBindings::retainObject(window_npobject_);
+    return window_npobject_;
 
   int npobject_route_id = channel_->GenerateRouteID();
   bool success = false;
@@ -207,7 +212,7 @@ NPObject* WebPluginProxy::GetWindowScriptNPObject() {
 
 NPObject* WebPluginProxy::GetPluginElement() {
   if (plugin_element_)
-    return WebBindings::retainObject(plugin_element_);
+    return plugin_element_;
 
   int npobject_route_id = channel_->GenerateRouteID();
   bool success = false;