PlzNavigate: add support for BLOCK_REQUEST during redirects

content/public/browser/navigation_throttle.h

Index: content/public/browser/navigation_throttle.h
diff --git a/content/public/browser/navigation_throttle.h b/content/public/browser/navigation_throttle.h
index ba49aa73a716aa81af9106d7b875df3f18fa26ac..56b989b8bdc8f1ed29e1f35cc210009a2d532788 100644
--- a/content/public/browser/navigation_throttle.h
+++ b/content/public/browser/navigation_throttle.h
@@ -34,9 +34,9 @@ class CONTENT_EXPORT NavigationThrottle {
     CANCEL_AND_IGNORE,
 
     // Blocks a navigation due to rules asserted before the request is made.
-    // This can only be returned from WillStartRequest. This will result in an
-    // error page for net::ERR_BLOCKED_BY_CLIENT being loaded in the frame that
-    // is navigated.
+    // This can only be returned from WillStartRequest and WillRedirectRequest.
+    // This will result in an error page for net::ERR_BLOCKED_BY_CLIENT being
+    // loaded in the frame that is navigated.
     BLOCK_REQUEST,
 
     // Blocks a navigation due to rules asserted by a response (for instance,