message: examples: use grpc route matcher
  Use the grpc mather instead of manually matching on the content-type
  header in the grpc s2s example.
diff: @@ -19,9 +19,7 @@ static_resources:
  routes:
  - match:
  prefix: "/"
  - headers:
  - - name: content-type
  - exact_match: application/grpc
  + grpc: {}
  route:
  cluster: local_service_grpc
  http_filters:
  