Introduce Promise mapping to the IDL generator

Source/modules/crypto/CryptoResult.h

Index: Source/modules/crypto/CryptoResult.h
diff --git a/Source/modules/crypto/CryptoResult.h b/Source/modules/crypto/CryptoResult.h
index 373a173295e49990d530e4760eee8496a01d1093..da34fa2bb0620e312d37b135e12061bcc168c1e5 100644
--- a/Source/modules/crypto/CryptoResult.h
+++ b/Source/modules/crypto/CryptoResult.h
@@ -31,7 +31,7 @@
 #ifndef CryptoResult_h
 #define CryptoResult_h
 
-#include "bindings/v8/ScriptObject.h"
+#include "bindings/v8/ScriptPromise.h"
 #include "public/platform/WebCrypto.h"
 #include "wtf/Forward.h"
 #include "wtf/ThreadSafeRefCounted.h"
@@ -58,7 +58,7 @@ public:
         return WebKit::WebCryptoResult(this);
     }
 
-    ScriptObject promise();
+    ScriptPromise promise();
 
 private:
     CryptoResult();