weaved: Rename "chromeos" -> "brillo" in include paths and namespaces

libchromeos is transitioning to libbrillo and chromeos namespaces
and include directory is changing to brillo.

Bug: 24872993
Change-Id: Ic91fe342fb2c29ae915300d1ce9ae8473303238b
diff --git a/buffet/weave_error_conversion.h b/buffet/weave_error_conversion.h
index 581131e..2240c3a 100644
--- a/buffet/weave_error_conversion.h
+++ b/buffet/weave_error_conversion.h
@@ -8,7 +8,7 @@
 #include <memory>
 #include <string>
 
-#include <chromeos/errors/error.h>
+#include <brillo/errors/error.h>
 #include <weave/error.h>
 
 namespace buffet {