Remove unused feature HTMLAppletElementLegacyCall

Source/bindings/core/v8/custom/V8HTMLPlugInElementCustom.cpp

Index: Source/bindings/core/v8/custom/V8HTMLPlugInElementCustom.cpp
diff --git a/Source/bindings/core/v8/custom/V8HTMLPlugInElementCustom.cpp b/Source/bindings/core/v8/custom/V8HTMLPlugInElementCustom.cpp
index 17a4d0757773ecb3bb6e3fe62f15b9c61f4670e5..6373d9f8bd9422c4d97aab3829176422d9d29ef9 100644
--- a/Source/bindings/core/v8/custom/V8HTMLPlugInElementCustom.cpp
+++ b/Source/bindings/core/v8/custom/V8HTMLPlugInElementCustom.cpp
@@ -198,12 +198,6 @@ void invokeOnScriptableObject(const v8::FunctionCallbackInfo<v8::Value>& info)
 
 } // namespace
 
-void V8HTMLAppletElement::legacyCallCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
-{
-    invokeOnScriptableObject<V8HTMLAppletElement>(info);
-    UseCounter::countIfNotPrivateScript(info.GetIsolate(), V8HTMLAppletElement::toImpl(info.Holder())->document(), UseCounter::HTMLAppletElementLegacyCall);
-}
-
 void V8HTMLEmbedElement::legacyCallCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     invokeOnScriptableObject<V8HTMLEmbedElement>(info);