Move isNavigationAllowed() check to main entry point for loads.

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.
  *
  * Redistribution and use in source and binary forms, with or without
@@ skipping 876 matching lines @@
     return policy;
 }
 
 void FrameLoader::load(const FrameLoadRequest& passedRequest, FrameLoadType frameLoadType,
     HistoryItem* historyItem, HistoryLoadType historyLoadType)
 {
     ASSERT(m_frame->document());
 
     RawPtr<LocalFrame> protect(m_frame.get());
 
+    if (!m_frame->isNavigationAllowed())

[dcheng, 2016/04/05 00:06:29]

Presumably, this will still be the main entry point after PlzNavigate, since we
still have to handle sync navigations somehow.

+        return;
+
     if (m_inStopAllLoaders)
         return;
 
     if (m_frame->page()->defersLoading() && isBackForwardLoadType(frameLoadType)) {
         m_deferredHistoryLoad = DeferredHistoryLoad::create(passedRequest.resourceRequest(), historyItem, frameLoadType, historyLoadType);
         return;
     }
 
     FrameLoadRequest request(passedRequest);
     request.resourceRequest().setHasUserGesture(UserGestureIndicator::processingUserGesture());
@@ skipping 677 matching lines @@
     // FIXME: We need a way to propagate insecure requests policy flags to
     // out-of-process frames. For now, we'll always use default behavior.
     if (!parentFrame->isLocalFrame())
         return nullptr;
 
     ASSERT(toLocalFrame(parentFrame)->document());
     return toLocalFrame(parentFrame)->document()->insecureNavigationsToUpgrade();
 }
 
 } // namespace blink