Merge 114373 - Web Inspector: [Chromium] Crash when inspecting empty IndexedDB object store.

Source/WebCore/inspector/InspectorIndexedDBAgent.cpp

 /*
  * Copyright (C) 2012 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 447 matching lines @@
         m_idbCursor->continueFunction(0, this, ec);
         m_idbCursor->postSuccessHandlerCallback();
         m_idbTransaction->didCompleteTaskEvents();
     }
 
     void end(bool hasMore)
     {
         if (!m_frontendProvider->frontend())
             return;
 
-        m_idbCursor->postSuccessHandlerCallback();
+        if (m_idbCursor)
+            m_idbCursor->postSuccessHandlerCallback();
         m_idbTransaction->didCompleteTaskEvents();
 
         switch (m_cursorType) {
         case ObjectStoreDataCursor:
             m_frontendProvider->frontend()->objectStoreDataLoaded(m_requestId, m_result.release(), hasMore);
             break;
         case IndexDataCursor:
             m_frontendProvider->frontend()->indexDataLoaded(m_requestId, m_result.release(), hasMore);
             break;
         }
@@ skipping 213 matching lines @@
         return;
     }
 
     RefPtr<DataLoaderCallback> dataLoaderCallback = DataLoaderCallback::create(m_frontendProvider, requestId, injectedScript, objectStoreName, indexName, idbKeyRange, skipCount, pageSize);
     dataLoaderCallback->start(idbFactory, document->securityOrigin(), document->frame(), databaseName);
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(INSPECTOR) && ENABLE(INDEXED_DATABASE)