Added: "timeout" parameter to "RequestInit"

To remove TypeScript warning via concluded declaration file.

Change-Id: I7be01417d69e1d5ad4bfa424bda7a47681362e97

Author: nea

doc/api/RequestInit.json

@@ -55,6 +55,11 @@
         "only-if-cached"
       ],
       "optional": true
+    },
+    "timeout": {
+      "type": "number",
+      "optional": true,
+      "description": "The network request timeout in milliseconds"
     }
   }
-}
+}

test/typescript/Request.test.ts

@@ -18,5 +18,5 @@ result.then((response) => {
 
 let request: Request = new Request('input', {body: 'foo'});
 request = new Request('input', {body: new Blob()});
-request = new Request('input', {body: new FormData()});
+request = new Request('input', {body: new FormData(), timeout: 400});
 let fetchWithRequest: Promise<Response> = fetch(request);