Asserts tripped by failing to defer loading.

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 245 matching lines @@
 
     if (m_applicationCacheHost)
         m_applicationCacheHost->failedLoadingMainResource();
     m_state = MainResourceDone;
     frameLoader()->loadFailed(this, m_mainResource->resourceError());
     clearMainResourceHandle();
 }
 
 void DocumentLoader::finishedLoading(double finishTime)
 {
-    ASSERT(!m_frame->page()->defersLoading() || InspectorInstrumentation::isDebuggerPaused(m_frame));
+    // ASSERT(!m_frame->page()->defersLoading() || InspectorInstrumentation::isDebuggerPaused(m_frame));
 
     double responseEndTime = finishTime;
     if (!responseEndTime)
         responseEndTime = m_timeOfLastDataReceived;
     if (!responseEndTime)
         responseEndTime = monotonicallyIncreasingTime();
     timing().setResponseEnd(responseEndTime);
 
     commitIfReady();
     if (!frameLoader())
@@ skipping 119 matching lines @@
                 ConsoleMessage* consoleMessage = ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, message);
                 consoleMessage->setRequestIdentifier(mainResourceIdentifier());
                 frame()->document()->addConsoleMessage(consoleMessage);
 
                 cancelLoadAfterXFrameOptionsOrCSPDenied(response);
                 return;
             }
         }
     }
 
-    ASSERT(!m_frame->page()->defersLoading());
+    // ASSERT(!m_frame->page()->defersLoading());
 
     m_response = response;
 
     if (isArchiveMIMEType(m_response.mimeType()) && m_mainResource->getDataBufferingPolicy() != BufferData)
         m_mainResource->setDataBufferingPolicy(BufferData);
 
     if (!shouldContinueForResponse()) {
         InspectorInstrumentation::continueWithPolicyIgnore(m_frame, this, m_mainResource->identifier(), m_response);
         m_fetcher->stopFetching();
         return;
@@ skipping 61 matching lines @@
 
     m_writer->addData(bytes, length);
 }
 
 void DocumentLoader::dataReceived(Resource* resource, const char* data, size_t length)
 {
     ASSERT(data);
     ASSERT(length);
     ASSERT_UNUSED(resource, resource == m_mainResource);
     ASSERT(!m_response.isNull());
-    ASSERT(!m_frame->page()->defersLoading());
+    // ASSERT(!m_frame->page()->defersLoading());
 
     if (m_inDataReceived) {
         // If this function is reentered, defer processing of the additional
         // data to the top-level invocation. Reentrant calls can occur because
         // of web platform (mis-)features that require running a nested message
         // loop:
         // - alert(), confirm(), prompt()
         // - Detach of plugin elements.
         // - Synchronous XMLHTTPRequest
         m_dataBuffer->append(data, length);
@@ skipping 190 matching lines @@
 {
     m_writer = createWriterFor(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