Remove preload support from the MemoryCache

sky/engine/core/fetch/FetchRequest.h

Index: sky/engine/core/fetch/FetchRequest.h
diff --git a/sky/engine/core/fetch/FetchRequest.h b/sky/engine/core/fetch/FetchRequest.h
index 3a69a6743b0b1f222c066689ab9d5d30058fc06b..17b9139652cc4d5e1a0af959b119d9b8a0afd8ca 100644
--- a/sky/engine/core/fetch/FetchRequest.h
+++ b/sky/engine/core/fetch/FetchRequest.h
@@ -53,8 +53,6 @@ public:
     const ResourceLoaderOptions& options() const { return m_options; }
     void setOptions(const ResourceLoaderOptions& options) { m_options = options; }
     ResourceLoadPriority priority() const { return m_priority; }
-    bool forPreload() const { return m_forPreload; }
-    void setForPreload(bool forPreload) { m_forPreload = forPreload; }
     DeferOption defer() const { return m_defer; }
     void setDefer(DeferOption defer) { m_defer = defer; }
     OriginRestriction originRestriction() const { return m_originRestriction; }
@@ -65,7 +63,6 @@ private:
     String m_charset;
     ResourceLoaderOptions m_options;
     ResourceLoadPriority m_priority;
-    bool m_forPreload;
     DeferOption m_defer;
     OriginRestriction m_originRestriction;
 };