[3/3 blink] Support redirect option of Request and "opaqueredirect" response type.

Source/modules/fetch/Request.idl

Index: Source/modules/fetch/Request.idl
diff --git a/Source/modules/fetch/Request.idl b/Source/modules/fetch/Request.idl
index 83f67adc8194532afb39109ce0206b930d20f1e3..74289789ec443bb53dd478cbe9e14116e977cff8 100644
--- a/Source/modules/fetch/Request.idl
+++ b/Source/modules/fetch/Request.idl
@@ -15,8 +15,7 @@ enum RequestContext {
 };
 enum RequestMode { "same-origin", "no-cors", "cors" };
 enum RequestCredentials { "omit", "same-origin", "include" };
-// TODO(horo): Support RequestRedirect when the chromium side patch land.
-// enum RequestRedirect { "follow", "error", "manual" };
+enum RequestRedirect { "follow", "error", "manual" };
 
 [
     Constructor(RequestInfo input, optional Dictionary requestInitDict),
@@ -34,8 +33,7 @@ enum RequestCredentials { "omit", "same-origin", "include" };
     readonly attribute DOMString referrer;
     readonly attribute RequestMode mode;
     readonly attribute RequestCredentials credentials;
-    // TODO(horo): Support redirect attribute when the chromium side patch land.
-    // readonly attribute RequestRedirect redirect;
+    readonly attribute RequestRedirect redirect;
 
     [RaisesException] Request clone();
 };