PlzNavigate: cancel any scheduled navigations when deciding to let the embedder handle a navigation.

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 1617 matching lines @@
                                                isClientRedirect, form);
   if (policy == NavigationPolicyCurrentTab)
     return true;
   if (policy == NavigationPolicyIgnore)
     return false;
   if (policy == NavigationPolicyHandledByClient) {
     m_isNavigationHandledByClient = true;
     // Mark the frame as loading since the embedder is handling the navigation.
     m_progressTracker->progressStarted();
 
+    m_frame->navigationScheduler().cancel();
+
     // If this is a form submit, dispatch that a form is being submitted
     // since the embedder is handling the navigation.
     if (form)
       client()->dispatchWillSubmitForm(form);
 
     return false;
   }
   if (!LocalDOMWindow::allowPopUp(*m_frame) &&
       !UserGestureIndicator::utilizeUserGesture())
     return false;
@@ skipping 244 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