Bug 1510124 - Ignore files generated by protobuf in the tree r=sylvestre

These are autogenerated files so we shouldn't try to reformat them.

Differential Revision: https://phabricator.services.mozilla.com/D13043

--HG--
extra : moz-landing-system : lando

.clang-format-ignore

@@ -40,6 +40,10 @@ widget/tests/.*
 xpcom/glue/tests/.*
 xpcom/tests/.*
 
+# Generated by protobuf
+.*/.*.pb.h
+.*/.*.pb.cc
+
 # Generated from ./tools/rewriting/ThirdPartyPaths.txt
 # awk '{print ""$1".*"}' ./tools/rewriting/ThirdPartyPaths.txt
 browser/components/translation/cld2/.*