Declarative resource hints go through mojo IPC to //content

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/html/parser/HTMLResourcePreloader.h"
 
 #include "core/html/parser/PreloadRequest.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include <memory>
 
 namespace blink {
 
 struct PreconnectTestCase {
     const char* baseURL;
     const char* url;
     bool isCORS;
     bool isHTTPS;
 };
 
 class PreloaderNetworkHintsMock : public NetworkHintsInterface {
 public:
     PreloaderNetworkHintsMock()
         : m_didPreconnect(false)
     {
     }
 
-    void dnsPrefetchHost(const String& host) const { }
+    void dnsPrefetchHost(const KURL& host) const
+    {
+    }
     void preconnectHost(const KURL& host, const CrossOriginAttributeValue crossOrigin) const override
     {
         m_didPreconnect = true;
         m_isHTTPS = host.protocolIs("https");
         m_isCrossOrigin = (crossOrigin == CrossOriginAttributeAnonymous);
     }
 
     bool didPreconnect() { return m_didPreconnect; }
     bool isHTTPS() { return m_isHTTPS; }
     bool isCrossOrigin() { return m_isCrossOrigin; }
@@ skipping 48 matching lines @@
         { "http://example.test", "//example.com", true, false },
         { "https://example.test", "//example.com", false, true },
         { "https://example.test", "//example.com", true, true },
     };
 
     for (const auto& testCase : testCases)
         test(testCase);
 }
 
 } // namespace blink