DocumentLoader::isCommittedButEmpty is timing-dependent.

third_party/WebKit/Source/core/loader/DocumentLoader.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 87 matching lines @@
 
     void didChangePerformanceTiming();
     void didObserveLoadingBehavior(WebLoadingBehaviorFlag);
     void updateForSameDocumentNavigation(const KURL&, SameDocumentNavigationSource);
     const ResourceResponse& response() const { return m_response; }
     bool isClientRedirect() const { return m_isClientRedirect; }
     void setIsClientRedirect(bool isClientRedirect) { m_isClientRedirect = isClientRedirect; }
     bool replacesCurrentHistoryItem() const { return m_replacesCurrentHistoryItem; }
     void setReplacesCurrentHistoryItem(bool replacesCurrentHistoryItem) { m_replacesCurrentHistoryItem = replacesCurrentHistoryItem; }
 
-    bool isCommittedButEmpty() const { return m_state == Committed; }
+    bool isCommittedButEmpty() const { return m_state >= Committed && !m_dataReceived; }
 
     void setSentDidFinishLoad() { m_state = SentDidFinishLoad; }
     bool sentDidFinishLoad() const { return m_state == SentDidFinishLoad; }
 
     NavigationType getNavigationType() const { return m_navigationType; }
     void setNavigationType(NavigationType navigationType) { m_navigationType = navigationType; }
 
     void upgradeInsecureRequest();
 
     void startLoadingMainResource();
@@ skipping 83 matching lines @@
 
     // The 'working' request. It may be mutated
     // several times from the original request to include additional
     // headers, cookie information, canonicalization and redirects.
     ResourceRequest m_request;
 
     ResourceResponse m_response;
 
     bool m_isClientRedirect;
     bool m_replacesCurrentHistoryItem;
+    bool m_dataReceived;
 
     NavigationType m_navigationType;
 
     DocumentLoadTiming m_documentLoadTiming;
 
     double m_timeOfLastDataReceived;
 
     Member<ApplicationCacheHost> m_applicationCacheHost;
 
     Member<ContentSecurityPolicy> m_contentSecurityPolicy;
     ClientHintsPreferences m_clientHintsPreferences;
     InitialScrollState m_initialScrollState;
 
     bool m_wasBlockedAfterXFrameOptionsOrCSP;
 
     enum State {
         NotStarted,
         Provisional,
         Committed,
-        DataReceived,
         MainResourceDone,
         SentDidFinishLoad
     };
     State m_state;
 
     // Used to protect against reentrancy into dataReceived().
     bool m_inDataReceived;
     RefPtr<SharedBuffer> m_dataBuffer;
 };
 
 DECLARE_WEAK_IDENTIFIER_MAP(DocumentLoader);
 
 } // namespace blink
 
 #endif // DocumentLoader_h