Revert 148069 and 148060 to see if they were responsible for a perf regression

Source/WebCore/loader/cache/CachedResource.cpp

Index: Source/WebCore/loader/cache/CachedResource.cpp
diff --git a/Source/WebCore/loader/cache/CachedResource.cpp b/Source/WebCore/loader/cache/CachedResource.cpp
index 1de221ae4c5d6c3bb6b90b23be1ee83c9725ec11..87575fc16aae4bc61e1f7f624f93ace8ba6669b3 100644
--- a/Source/WebCore/loader/cache/CachedResource.cpp
+++ b/Source/WebCore/loader/cache/CachedResource.cpp
@@ -43,7 +43,7 @@
 #include "ResourceHandle.h"
 #include "SecurityOrigin.h"
 #include "SecurityPolicy.h"
-#include "ResourceLoader.h"
+#include "SubresourceLoader.h"
 #include "WebCoreMemoryInstrumentation.h"
 #include <wtf/CurrentTime.h>
 #include <wtf/MathExtras.h>
@@ -338,12 +338,14 @@ void CachedResource::load(CachedResourceLoader* cachedResourceLoader, const Reso
         m_fragmentIdentifierForRequest = String();
     }
 
-    m_loader = ResourceLoader::create(cachedResourceLoader->frame(), this, request, options);
+    m_loader = SubresourceLoader::create(cachedResourceLoader->frame(), this, request, options);
 
     if (!m_loader) {
         failBeforeStarting();
         return;
     }
+
+    m_loader->start();
     m_status = Pending;
 }