Cleanup ResourceLoadPriority setting

Source/core/fetch/FetchContext.h

Index: Source/core/fetch/FetchContext.h
diff --git a/Source/core/fetch/FetchContext.h b/Source/core/fetch/FetchContext.h
index 740addee78bc6d7f2d1f604e6ef2095db8e2368d..dbcb39b1809f5f6cfc60a6c4ea8137d58f618c39 100644
--- a/Source/core/fetch/FetchContext.h
+++ b/Source/core/fetch/FetchContext.h
@@ -103,12 +103,9 @@ public:
     virtual void upgradeInsecureRequest(FetchRequest&);
     virtual void addClientHintsIfNecessary(FetchRequest&);
     virtual void addCSPHeaderIfNecessary(Resource::Type, FetchRequest&);
-    virtual bool isLowPriorityIframe() const { return false; }
 
-    virtual bool fetchDeferLateScripts() const { return false; }
-    virtual bool fetchIncreaseFontPriority() const { return false; }
-    virtual bool fetchIncreaseAsyncScriptPriority() const { return false; }
     virtual bool fetchIncreasePriorities() const { return false; }
+    virtual ResourceLoadPriority modifyPriorityForExperiments(ResourceLoadPriority priority, Resource::Type, const FetchRequest&) { return priority; }
 
 protected:
     FetchContext() { }