Implement request's redirect mode and RequestRedirect for Fetch

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 9c25650472dcfc51362fcd58fa8349d06b3745eb..31b13a3ca1b9ef0f460f60188e78bf925c96901c 100644
--- a/Source/modules/fetch/RequestInit.cpp
+++ b/Source/modules/fetch/RequestInit.cpp
@@ -31,6 +31,7 @@ RequestInit::RequestInit(ExecutionContext* context, const Dictionary& options, E
     }
     DictionaryHelper::get(options, "mode", mode);
     DictionaryHelper::get(options, "credentials", credentials);
+    DictionaryHelper::get(options, "redirect", redirect);
 
     v8::Local<v8::Value> body;
     if (!DictionaryHelper::get(options, "body", body) || body->IsUndefined() || body->IsNull())