Remove HTTP specific logic from BlindSignAuth and dependencies

PiperOrigin-RevId: 627465992
diff --git a/build/source_list.json b/build/source_list.json
index fb45e82..191c426 100644
--- a/build/source_list.json
+++ b/build/source_list.json
@@ -1628,14 +1628,15 @@
     "quiche/blind_sign_auth/blind_sign_auth.h",
     "quiche/blind_sign_auth/blind_sign_auth_interface.h",
     "quiche/blind_sign_auth/blind_sign_auth_protos.h",
-    "quiche/blind_sign_auth/blind_sign_http_response.h",
     "quiche/blind_sign_auth/blind_sign_message_interface.h",
+    "quiche/blind_sign_auth/blind_sign_message_response.h",
     "quiche/blind_sign_auth/cached_blind_sign_auth.h",
     "quiche/blind_sign_auth/test_tools/mock_blind_sign_auth_interface.h",
-    "quiche/blind_sign_auth/test_tools/mock_blind_sign_http_interface.h"
+    "quiche/blind_sign_auth/test_tools/mock_blind_sign_message_interface.h"
   ],
   "blind_sign_auth_srcs": [
     "quiche/blind_sign_auth/blind_sign_auth.cc",
+    "quiche/blind_sign_auth/blind_sign_message_response.cc",
     "quiche/blind_sign_auth/cached_blind_sign_auth.cc"
   ],
   "blind_sign_auth_tests_hdrs": [