Remove resource type-specific fetching logic from ResourceFetcher

Source/core/html/parser/HTMLResourcePreloader.cpp

 /*
  * Copyright (C) 2013 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 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/html/parser/HTMLResourcePreloader.h"
 
 #include "core/dom/Document.h"
 #include "core/fetch/FetchInitiatorInfo.h"
 #include "core/fetch/ResourceFetcher.h"
+#include "core/loader/DocumentLoader.h"
 #include "platform/network/NetworkHints.h"
 #include "public/platform/Platform.h"
 
 namespace blink {
 
 inline HTMLResourcePreloader::HTMLResourcePreloader(Document& document)
     : m_document(document)
 {
 }
 
@@ skipping 23 matching lines @@
     }
     preconnect(host, crossOrigin);
 }
 
 void HTMLResourcePreloader::preload(PassOwnPtr<PreloadRequest> preload)
 {
     if (preload->isPreconnect()) {
         preconnectHost(preload.get());
         return;
     }
+    if (!m_document->loader())
+        return;
     FetchRequest request = preload->resourceRequest(m_document);
+    if (preload->resourceType() == Resource::Script || preload->resourceType() == Resource::CSSStyleSheet)
+        request.setCharset(preload->charset().isEmpty() ? m_document->charset().string() : preload->charset());
+    request.setForPreload(true);
     Platform::current()->histogramCustomCounts("WebCore.PreloadDelayMs", static_cast<int>(1000 * (monotonicallyIncreasingTime() - preload->discoveryTime())), 0, 2000, 20);
-    m_document->fetcher()->preload(preload->resourceType(), request, preload->charset());
+    m_document->loader()->startPreload(preload->resourceType(), request);
 }
 
 } // namespace blink