Fix stylelint-config-standard issues in network/requestHeadersTree.css
Fix stylelint-config-standard issues in network/requestHeadersTree.css

Bug: chromium:1083142
Cq-Exclude-Trybots: luci.devtools-frontend.try:devtools_frontend_mac_rel
Change-Id: I01b0a9b22ac89503d09d5f17e649143c87d1d489
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2282344
Commit-Queue: Kim-Anh Tran <a72f38a79b5fac6811022b8a7fb84830d856c9c9@chromium.org>
Reviewed-by: Mathias Bynens <17a2cbc4e33156874a9862b0f530521117e66a3d@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend