Clean up some old TODOs

chrome/renderer/renderer_webidbdatabase_impl.cc

Index: chrome/renderer/renderer_webidbdatabase_impl.cc
diff --git a/chrome/renderer/renderer_webidbdatabase_impl.cc b/chrome/renderer/renderer_webidbdatabase_impl.cc
index d65e8a186024c750b045bf509a655cc3667e7697..a4fdf773de4bdb070276dbcc59c6a0a98335f4f5 100644
--- a/chrome/renderer/renderer_webidbdatabase_impl.cc
+++ b/chrome/renderer/renderer_webidbdatabase_impl.cc
@@ -25,8 +25,10 @@ RendererWebIDBDatabaseImpl::RendererWebIDBDatabaseImpl(int32 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_));
 }