Fix handling of external protocols with PlzNavigate.

third_party/WebKit/Source/web/WebSecurityPolicy.cpp

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 42 matching lines @@
 void WebSecurityPolicy::registerURLSchemeAsSupportingFetchAPI(
     const WebString& scheme) {
   SchemeRegistry::registerURLSchemeAsSupportingFetchAPI(scheme);
 }
 
 void WebSecurityPolicy::registerURLSchemeAsFirstPartyWhenTopLevel(
     const WebString& scheme) {
   SchemeRegistry::registerURLSchemeAsFirstPartyWhenTopLevel(scheme);
 }
 
-void WebSecurityPolicy::registerURLSchemeAsEmptyDocument(
-    const WebString& scheme) {
-  SchemeRegistry::registerURLSchemeAsEmptyDocument(scheme);
-}
-
 void WebSecurityPolicy::addOriginAccessWhitelistEntry(
     const WebURL& sourceOrigin,
     const WebString& destinationProtocol,
     const WebString& destinationHost,
     bool allowDestinationSubdomains) {
   SecurityPolicy::addOriginAccessWhitelistEntry(
       *SecurityOrigin::create(sourceOrigin), destinationProtocol,
       destinationHost, allowDestinationSubdomains);
 }
 
@@ skipping 34 matching lines @@
     const WebString& scheme) {
   SchemeRegistry::registerURLSchemeAsNotAllowingJavascriptURLs(scheme);
 }
 
 void WebSecurityPolicy::registerURLSchemeAsAllowedForReferrer(
     const WebString& scheme) {
   SchemeRegistry::registerURLSchemeAsAllowedForReferrer(scheme);
 }
 
 }  // namespace blink