Add webdriver deletecookies function

components/net/resource_thread.rs

@@ -236,6 +236,14 @@ impl ResourceChannelManager {
                     http_state,
                 ),
             },
+            CoreResourceMsg::DeleteCookies(request) => {
+                http_state
+                    .cookie_jar
+                    .write()
+                    .unwrap()
+                    .clear_storage(&request);
+                return true;
+            },
             CoreResourceMsg::FetchRedirect(req_init, res_init, sender, cancel_chan) => self
                 .resource_manager
                 .fetch(req_init, Some(res_init), sender, http_state, cancel_chan),