Fix handling of external protocols with PlzNavigate.

third_party/WebKit/public/web/WebSecurityPolicy.h

 /*
  * 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 43 matching lines @@
 
   // Registers an HTTP-like URL scheme that supports the Fetch API.
   BLINK_EXPORT static void registerURLSchemeAsSupportingFetchAPI(
       const WebString&);
 
   // Registers a URL scheme which will always be considered the first-party when
   // loaded in a top-level context.
   BLINK_EXPORT static void registerURLSchemeAsFirstPartyWhenTopLevel(
       const WebString&);
 
-  // Registers a URL scheme as strictly empty documents, allowing them to
-  // commit synchronously.
-  BLINK_EXPORT static void registerURLSchemeAsEmptyDocument(const WebString&);
-
   // Support for whitelisting access to origins beyond the same-origin policy.
   BLINK_EXPORT static void addOriginAccessWhitelistEntry(
       const WebURL& sourceOrigin,
       const WebString& destinationProtocol,
       const WebString& destinationHost,
       bool allowDestinationSubdomains);
   BLINK_EXPORT static void removeOriginAccessWhitelistEntry(
       const WebURL& sourceOrigin,
       const WebString& destinationProtocol,
       const WebString& destinationHost,
@@ skipping 25 matching lines @@
   BLINK_EXPORT static void registerURLSchemeAsAllowedForReferrer(
       const WebString&);
 
  private:
   WebSecurityPolicy();
 };
 
 }  // namespace blink
 
 #endif