Fix handling of external protocols with PlzNavigate.

third_party/WebKit/Source/platform/weborigin/SchemeRegistry.h

 /*
  * Copyright (C) 2010 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 48 matching lines @@
   static bool shouldTreatURLSchemeAsSecure(const String&);
 
   static void registerURLSchemeAsNoAccess(const String&);
   static bool shouldTreatURLSchemeAsNoAccess(const String&);
 
   // Display-isolated schemes can only be displayed (in the sense of
   // SecurityOrigin::canDisplay) by documents from the same scheme.
   static void registerURLSchemeAsDisplayIsolated(const String&);
   static bool shouldTreatURLSchemeAsDisplayIsolated(const String&);
 
-  static void registerURLSchemeAsEmptyDocument(const String&);
   static bool shouldLoadURLSchemeAsEmptyDocument(const String&);
 
   static void setDomainRelaxationForbiddenForURLScheme(bool forbidden,
                                                        const String&);
   static bool isDomainRelaxationForbiddenForURLScheme(const String&);
 
   // Such schemes should delegate to SecurityOrigin::canRequest for any URL
   // passed to SecurityOrigin::canDisplay.
   static bool canDisplayOnlyIfCanRequest(const String& scheme);
 
@@ skipping 62 matching lines @@
       const String& scheme);
   static bool schemeShouldBypassSecureContextCheck(const String& scheme);
 
  private:
   static const URLSchemesSet& localSchemes();
 };
 
 }  // namespace blink
 
 #endif  // SchemeRegistry_h