PlzNavigate: Fix anchor-no-multiple-windows.html layout test.

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) Research In Motion Limited 2009. 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:
@@ skipping 196 matching lines @@
   bool shouldContinueForNavigationPolicy(const ResourceRequest&,
                                          const SubstituteData&,
                                          DocumentLoader*,
                                          ContentSecurityPolicyDisposition,
                                          NavigationType,
                                          NavigationPolicy,
                                          bool shouldReplaceCurrentEntry,
                                          bool isClientRedirect,
                                          HTMLFormElement*);
 
+  // PlzNavigate: Navigations handled by the client are treated as
+  // provisional navigations.
+  bool hasProvisionalNavigation() const {
+    return provisionalDocumentLoader() || m_isNavigationHandledByClient;
+  }
+
   DECLARE_TRACE();
 
   static void setReferrerForFrameRequest(FrameLoadRequest&);
 
  private:
   void checkTimerFired(TimerBase*);
 
   bool prepareRequestForThisFrame(FrameLoadRequest&);
   FrameLoadType determineFrameLoadType(const FrameLoadRequest&);
 
@@ skipping 89 matching lines @@
   SandboxFlags m_forcedSandboxFlags;
 
   bool m_dispatchingDidClearWindowObjectInMainWorld;
   bool m_protectProvisionalLoader;
   bool m_isNavigationHandledByClient;
 };
 
 }  // namespace blink
 
 #endif  // FrameLoader_h