Clean up some old TODOs

chrome/renderer/renderer_webidbdatabase_impl.cc

 // Copyright (c) 2010 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 "chrome/renderer/renderer_webidbdatabase_impl.h"
 
 #include "chrome/common/indexed_db_messages.h"
 #include "chrome/renderer/render_thread.h"
 #include "chrome/renderer/indexed_db_dispatcher.h"
 #include "chrome/renderer/renderer_webidbobjectstore_impl.h"
 #include "chrome/renderer/renderer_webidbtransaction_impl.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebString.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebVector.h"
 
 using WebKit::WebDOMStringList;
 using WebKit::WebExceptionCode;
 using WebKit::WebFrame;
 using WebKit::WebIDBCallbacks;
 using WebKit::WebIDBTransaction;
 using WebKit::WebString;
 using WebKit::WebVector;
 
 RendererWebIDBDatabaseImpl::RendererWebIDBDatabaseImpl(int32 idb_database_id)
     : idb_database_id_(idb_database_id) {
 }
 
 RendererWebIDBDatabaseImpl::~RendererWebIDBDatabaseImpl() {
-  // TODO(jorlow): Is it possible for this to be destroyed but still have
-  //               pending callbacks?  If so, fix!
+  // It's not possible for there to be pending callbacks that address this
+  // object since inside WebKit, they hold a reference to the object wich owns
+  // this object. But, if that ever changed, then we'd need to invalidate
+  // any such pointers.
   RenderThread::current()->Send(new IndexedDBHostMsg_DatabaseDestroyed(
       idb_database_id_));
 }
 
 WebString RendererWebIDBDatabaseImpl::name() const {
   string16 result;
   RenderThread::current()->Send(
       new IndexedDBHostMsg_DatabaseName(idb_database_id_, &result));
   return result;
 }
@@ skipping 70 matching lines @@
 
   int transaction_id;
   RenderThread::current()->Send(
       new IndexedDBHostMsg_DatabaseTransaction(
           idb_database_id_, object_stores, mode,
           timeout, &transaction_id, &ec));
   if (!transaction_id)
     return NULL;
   return new RendererWebIDBTransactionImpl(transaction_id);
 }