Declarative resource hints go through mojo IPC to //content

third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp

 /*
  * Copyright (C) 2010 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:
  * 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 441 matching lines @@
         constructTreeFromCompactHTMLToken(*it);
 
         if (isStopped())
             break;
 
         if (!m_triedLoadingLinkHeaders && document()->loader()) {
             String linkHeader = document()->loader()->response().httpHeaderField(HTTPNames::Link);
             if (!linkHeader.isEmpty()) {
                 ASSERT(chunk);
                 LinkLoader::loadLinksFromHeader(linkHeader, document()->loader()->response().url(),
-                    document(), NetworkHintsInterfaceImpl(), LinkLoader::OnlyLoadResources, &(chunk->viewport));
+                    document(), LinkLoader::OnlyLoadResources, &(chunk->viewport));
                 m_triedLoadingLinkHeaders = true;
             }
         }
 
         if (isWaitingForScripts()) {
             ASSERT(it + 1 == tokens->end()); // The </script> is assumed to be the last token of this bunch.
             runScriptsForPausedTreeBuilder();
             validateSpeculations(std::move(chunk));
             break;
         }
@@ skipping 636 matching lines @@
         DEFINE_STATIC_LOCAL(CustomCountHistogram, successHistogram, ("PreloadScanner.DocumentWrite.ExecutionTime.Success", 1, 10000, 50));
         successHistogram.count(duration);
     } else {
         DEFINE_STATIC_LOCAL(CustomCountHistogram, failureHistogram, ("PreloadScanner.DocumentWrite.ExecutionTime.Failure", 1, 10000, 50));
         failureHistogram.count(duration);
     }
 
 }
 
 } // namespace blink