minor feature: a hang when denying a window.open using setWindowOpenHandler when nativeWindowOpen: false. #29881 (Also in 13, 14).an where request headers were cleared if the optional "requestHeaders" parameter was not included in the webRequest.onBeforeSendHeaders callback response object. #29834 (Also in 13, 14).Backported for chromium:1211215. #29784.Security: backported for CVE-2021-30547. #29789.Security: backported for CVE-2021-30553. #29818.Security: backported for CVE-2021-30554. #29822.Security: backported for chromium:1194689. #29816.Security: backported for chromium:1209558. #29814.