https://ci.chromium.org/p/chromium/builders/luci.chromium.try/linux_chromium_rel_ng/134536

Some header files generated, but not treated as output of target.
Also I'm suspecting there is missing dependency around them.

e.g. There should be dependency from obj/third_party/blink/renderer/core/core_generated/css_unresolved_property.o 
to
en/third_party/blink/renderer/core/css/properties/longhands/border_inline_start_color.h