DOM wrappers that are not retained from Dart should be collected.

Source/WebCore/bindings/dart/DartController.cpp

Index: Source/WebCore/bindings/dart/DartController.cpp
diff --git a/Source/WebCore/bindings/dart/DartController.cpp b/Source/WebCore/bindings/dart/DartController.cpp
index 37a485f62a6a91d15e17665d4ffe616f01fa958e..d870e9b2308417c71d971645db2a95dc4fc92fc0 100644
--- a/Source/WebCore/bindings/dart/DartController.cpp
+++ b/Source/WebCore/bindings/dart/DartController.cpp
@@ -97,21 +97,6 @@ PassRefPtr<DartIsolate> DartController::createIsolate(Document* document, PassRe
     return dartIsolate.release();
 }
 
-void DartController::shutdownIsolate(DartIsolate* isolate)
-{
-    Dart_Isolate currentIsolate = Dart_CurrentIsolate();
-    if (currentIsolate)
-        Dart_ExitIsolate();
-    Dart_EnterIsolate(isolate->isolate());
-    Dart_ShutdownIsolate();
-    if (currentIsolate)
-        Dart_EnterIsolate(currentIsolate);
-
-    *DartUtilities::recursionForIsolate(isolate->isolate()) = 0;
-    DartUtilities::unregisterIsolate(isolate->isolate());
-    DartDebugServer::shared().unregisterIsolate(isolate);
-}
-
 DartController::DartController(Frame* frame)
     : m_frame(frame)
     , m_scriptsLoaded(false)
@@ -131,16 +116,6 @@ DartController::DartController(Frame* frame)
 void DartController::clearWindowShell()
 {
     m_scriptsLoaded = false;
-
-    for (size_t i = 0; i < m_isolates.size(); ++i) {
-        DartIsolate::Scope scope(m_isolates[i]);
-        // FIXME: clear event listeners.
-        // FIXME: clear console messages.
-        DartDOMMap* domMap = DartUtilities::domMapForCurrentIsolate();
-        for (DartDOMMap::iterator it = domMap->begin(); it != domMap->end(); ++it)
-            DartDOMWrapper::derefDOMObject(it->second, it->first);
-    }
-
     m_isolates.clear();
 }