Don't stop the documentLoader on navigations.

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 416 matching lines @@
         return false;
 
     return true;
 }
 
 void DocumentLoader::responseReceived(Resource* resource, const ResourceResponse& response)
 {
     ASSERT_UNUSED(resource, m_mainResource == resource);
     RefPtr<DocumentLoader> protect(this);
 
+    frameLoader()->onResponseReceived();
+
     m_applicationCacheHost->didReceiveResponseForMainResource(response);
 
     // The memory cache doesn't understand the application cache or its caching rules. So if a main resource is served
     // from the application cache, ensure we don't save the result for future use. All responses loaded
     // from appcache will have a non-zero appCacheID().
     if (response.appCacheID())
         memoryCache()->remove(m_mainResource.get());
 
     DEFINE_STATIC_LOCAL(AtomicString, xFrameOptionHeader, ("x-frame-options", AtomicString::ConstructFromLiteral));
     HTTPHeaderMap::const_iterator it = response.httpHeaderFields().find(xFrameOptionHeader);
@@ skipping 394 matching lines @@
 void DocumentLoader::replaceDocument(const String& source, Document* ownerDocument)
 {
     m_frame->loader().stopAllLoaders();
     m_writer = createWriterFor(m_frame, ownerDocument, m_frame->document()->url(), mimeType(), m_writer ? m_writer->encoding() : emptyAtom,  m_writer ? m_writer->encodingWasChosenByUser() : false, true);
     if (!source.isNull())
         m_writer->appendReplacingData(source);
     endWriting(m_writer.get());
 }
 
 } // namespace WebCore