Let's try this again. The regressions were caused by an incorrect use...

webkit/port/bindings/v8/v8_proxy.cpp

 // Copyright (c) 2008, Google Inc.
 // All rights reserved.
 // 
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 // 
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 2372 matching lines @@
     case Node::DOCUMENT_FRAGMENT_NODE:
       type = V8ClassIndex::DOCUMENTFRAGMENT;
       break;
     case Node::ENTITY_REFERENCE_NODE:
       type = V8ClassIndex::ENTITYREFERENCE;
       break;
     default:
       type = V8ClassIndex::NODE;
   }
 
+  // Find the context to which the node belongs and create the wrapper
+  // in that context.  If the node is not in a document, the current
+  // context is used.
+  v8::Local<v8::Context> context;
+  Document* doc = node->document();
+  if (doc) {
+    context = V8Proxy::GetContext(doc->frame());
+  }
+  if (!context.IsEmpty()) {
+    context->Enter();
+  }
+
   // Set the peer object for future access.
   // InstantiateV8Object automatically casts node to Peerable*.
   v8::Local<v8::Object> result =
       InstantiateV8Object(type, V8ClassIndex::NODE, node);
+
+  // Exit the node's context if it was entered.
+  if (!context.IsEmpty()) {
+    context->Exit();
+  }
+
   if (result.IsEmpty()) {
     // If instantiation failed it's important not to add the result
     // to the DOM node map. Instead we return an empty handle, which
     // should already be handled by callers of this function in case
     // the node is NULL.
     return result;
   }
 
   dom_node_map().set(node, v8::Persistent<v8::Object>::New(result));
 
@@ skipping 232 matching lines @@
     v8::Handle<v8::Object> global = context->Global();
     global->Set(v8::String::New(name), instance);
 }
 
 void V8Proxy::ProcessConsoleMessages()
 {
     ConsoleMessageManager::ProcessDelayedMessages();
 }
 
 }  // namespace WebCore