[Fetch API] Remove unused code.

The outer FormData in RequestInit::RequestInit is shadowed by the inner
one and completely useless.

The variable was introduced at [1] and the bug was found by brucedawson@.

1: https://codereview.chromium.org/1301523002

BUG=457484

Review URL: https://codereview.chromium.org/1293873003

git-svn-id: svn://svn.chromium.org/blink/trunk@200902 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/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)));