Simplify CustomElementScheduler by passing the enum for callback type directly.

Source/core/dom/custom/CustomElementLifecycleCallbacks.h

Index: Source/core/dom/custom/CustomElementLifecycleCallbacks.h
diff --git a/Source/core/dom/custom/CustomElementLifecycleCallbacks.h b/Source/core/dom/custom/CustomElementLifecycleCallbacks.h
index aa182e625d97aaa497e172b1daecf2f1ef9864bf..a713815e93058efce69cc8eb5eddfb763c5e94e5 100644
--- a/Source/core/dom/custom/CustomElementLifecycleCallbacks.h
+++ b/Source/core/dom/custom/CustomElementLifecycleCallbacks.h
@@ -42,18 +42,6 @@ class CustomElementLifecycleCallbacks : public RefCounted<CustomElementLifecycle
 public:
     virtual ~CustomElementLifecycleCallbacks() { }
 
-    bool hasCreatedCallback() const { return m_which & Created; }
-    virtual void created(Element*) = 0;
-
-    bool hasAttachedCallback() const { return m_which & Attached; }
-    virtual void attached(Element*) = 0;
-
-    bool hasDetachedCallback() const { return m_which & Detached; }
-    virtual void detached(Element*) = 0;
-
-    bool hasAttributeChangedCallback() const { return m_which & AttributeChanged; }
-    virtual void attributeChanged(Element*, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue) = 0;
-
     enum CallbackType {
         None             = 0,
         Created          = 1 << 0,
@@ -62,6 +50,13 @@ public:
         AttributeChanged = 1 << 3
     };
 
+    bool hasCallback(CallbackType type) const { return m_which & type; }
+
+    virtual void created(Element*) = 0;
+    virtual void attached(Element*) = 0;
+    virtual void detached(Element*) = 0;
+    virtual void attributeChanged(Element*, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue) = 0;
+
 protected:
     CustomElementLifecycleCallbacks(CallbackType which) : m_which(which) { }