[Fetch API] Remove unused code.

Source/modules/fetch/RequestInit.cpp

Index: Source/modules/fetch/RequestInit.cpp
diff --git a/Source/modules/fetch/RequestInit.cpp b/Source/modules/fetch/RequestInit.cpp
index b0c315bf6c818de48e49671ca7f77e325a962141..a65802ab5f2571a2213e86899683f38fc82209f8 100644
--- a/Source/modules/fetch/RequestInit.cpp
+++ b/Source/modules/fetch/RequestInit.cpp
@@ -38,7 +38,6 @@ RequestInit::RequestInit(ExecutionContext* context, const Dictionary& options, E
     v8::Local<v8::Value> v8Body;
     if (!DictionaryHelper::get(options, "body", v8Body) || v8Body->IsUndefined() || v8Body->IsNull())
         return;
-    RefPtr<FormData> formData = FormData::create();
     v8::Isolate* isolate = toIsolate(context);
     if (v8Body->IsArrayBuffer()) {
         body = FetchFormDataConsumerHandle::create(V8ArrayBuffer::toImpl(v8::Local<v8::Object>::Cast(v8Body)));