Deal with frame removal by content scripts

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

 /*
  * Copyright (C) 2006, 2007, 2008 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 287 matching lines @@
     if (!frameLoader())
         return;
 
     if (!maybeCreateArchive()) {
         // If this is an empty document, it will not have actually been created yet. Commit dummy data so that
         // DocumentWriter::begin() gets called and creates the Document.
         if (!m_writer)
             commitData(0, 0);
     }
 
+    if (!m_frame)
+        return;
+
     m_applicationCacheHost->finishedLoadingMainResource();
     endWriting(m_writer.get());
     if (m_state < MainResourceDone)
         m_state = MainResourceDone;
     clearMainResourceHandle();
 }
 
 void DocumentLoader::updateRequest(Resource* resource, const ResourceRequest& request)
 {
     ASSERT_UNUSED(resource, resource == m_mainResource);
@@ skipping 447 matching lines @@
 {
     m_writer = createWriterFor(ownerDocument, init, mimeType(), m_writer ? m_writer->encoding() : emptyAtom, true, ForceSynchronousParsing);
     if (!source.isNull())
         m_writer->appendReplacingData(source);
     endWriting(m_writer.get());
 }
 
 DEFINE_WEAK_IDENTIFIER_MAP(DocumentLoader);
 
 } // namespace blink