Revert 131679 - Add DCHECK to ensure IndexedDBDispatcher doesn't get re-created.

content/common/indexed_db/indexed_db_dispatcher.cc

Index: content/common/indexed_db/indexed_db_dispatcher.cc
===================================================================
--- content/common/indexed_db/indexed_db_dispatcher.cc	(revision 131682)
+++ content/common/indexed_db/indexed_db_dispatcher.cc	(working copy)
@@ -38,9 +38,6 @@
 
 namespace {
 
-IndexedDBDispatcher* const HAS_BEEN_DELETED =
-    reinterpret_cast<IndexedDBDispatcher*>(0x1);
-
 int32 CurrentWorkerId() {
   return WorkerTaskRunner::Instance()->CurrentWorkerId();
 }
@@ -54,14 +51,10 @@
 }
 
 IndexedDBDispatcher::~IndexedDBDispatcher() {
-  g_idb_dispatcher_tls.Pointer()->Set(HAS_BEEN_DELETED);
+  g_idb_dispatcher_tls.Pointer()->Set(NULL);
 }
 
 IndexedDBDispatcher* IndexedDBDispatcher::ThreadSpecificInstance() {
-  if (g_idb_dispatcher_tls.Pointer()->Get() == HAS_BEEN_DELETED) {
-    NOTREACHED() << "Re-instantiating TLS IndexedDBDispatcher.";
-    g_idb_dispatcher_tls.Pointer()->Set(NULL);
-  }
   if (g_idb_dispatcher_tls.Pointer()->Get())
     return g_idb_dispatcher_tls.Pointer()->Get();