DocumentLoader::isCommittedButEmpty is timing-dependent.

Source/core/loader/DocumentLoader.cpp

Index: Source/core/loader/DocumentLoader.cpp
diff --git a/Source/core/loader/DocumentLoader.cpp b/Source/core/loader/DocumentLoader.cpp
index 3e985b4db5641f6800d4e2b23dea2673abf356dd..d245eabe46fd267cabf0cbb553ce474556f4814e 100644
--- a/Source/core/loader/DocumentLoader.cpp
+++ b/Source/core/loader/DocumentLoader.cpp
@@ -294,7 +294,7 @@ void DocumentLoader::finishedLoading(double finishTime)
 
     if (!m_mainDocumentError.isNull())
         return;
-    m_state = MainResourceDone;
+    m_state = url() == blankURL() || (m_mainResource && !m_mainResource->encodedSize()) ? MainResourceDoneButEmpty : MainResourceDone;
 
     // If the document specified an application cache manifest, it violates the author's intent if we store it in the memory cache
     // and deny the appcache the chance to intercept it in the future, so remove from the memory cache.