Clean up around FrameFetchContext

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Kris Jordan <krisjordan@gmail.com>
  * Copyright (C) 2011 Google Inc. All rights reserved.
@@ skipping 175 matching lines @@
       m_progressTracker(ProgressTracker::create(frame)),
       m_loadType(FrameLoadTypeStandard),
       m_inStopAllLoaders(false),
       m_checkTimer(TaskRunnerHelper::get(TaskType::Networking, frame),
                    this,
                    &FrameLoader::checkTimerFired),
       m_forcedSandboxFlags(SandboxNone),
       m_dispatchingDidClearWindowObjectInMainWorld(false),
       m_protectProvisionalLoader(false),
       m_isNavigationHandledByClient(false) {
+  DCHECK(m_frame);
   TRACE_EVENT_OBJECT_CREATED_WITH_ID("loading", "FrameLoader", this);
   takeObjectSnapshot();
 }
 
 FrameLoader::~FrameLoader() {
   // Verify that this FrameLoader has been detached.
   DCHECK(!m_progressTracker);
 }
 
 DEFINE_TRACE(FrameLoader) {
@@ skipping 1752 matching lines @@
                          m_documentLoader ? m_documentLoader->url() : String());
   return tracedValue;
 }
 
 inline void FrameLoader::takeObjectSnapshot() const {
   TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID("loading", "FrameLoader", this,
                                       toTracedValue());
 }
 
 }  // namespace blink