Remove the compatibility version of BlindSignAuth::GetTokens, now that Chrome is setting the ProxyLayer parameter.

PiperOrigin-RevId: 587682283

quiche/blind_sign_auth/blind_sign_auth.cc

diff --git a/quiche/blind_sign_auth/blind_sign_auth.cc b/quiche/blind_sign_auth/blind_sign_auth.cc
index aa2aac0..5224e0e 100644
--- a/quiche/blind_sign_auth/blind_sign_auth.cc
+++ b/quiche/blind_sign_auth/blind_sign_auth.cc
@@ -47,11 +47,6 @@
 }  // namespace
 
 void BlindSignAuth::GetTokens(std::string oauth_token, int num_tokens,
-                              SignedTokenCallback callback) {
-  GetTokens(oauth_token, num_tokens, ProxyLayer::kProxyA, std::move(callback));
-}
-
-void BlindSignAuth::GetTokens(std::string oauth_token, int num_tokens,
                               ProxyLayer proxy_layer,
                               SignedTokenCallback callback) {
   // Create GetInitialData RPC.

quiche/blind_sign_auth/blind_sign_auth.h

diff --git a/quiche/blind_sign_auth/blind_sign_auth.h b/quiche/blind_sign_auth/blind_sign_auth.h
index 567046c..a725ece 100644
--- a/quiche/blind_sign_auth/blind_sign_auth.h
+++ b/quiche/blind_sign_auth/blind_sign_auth.h
@@ -38,11 +38,6 @@
   void GetTokens(std::string oauth_token, int num_tokens,
                  ProxyLayer proxy_layer, SignedTokenCallback callback) override;
 
-  // Returns signed unblinded tokens and their expiration time in a callback.
-  // This function sends ProxyLayer::kProxyA by default for compatibility.
-  void GetTokens(std::string oauth_token, int num_tokens,
-                 SignedTokenCallback callback);
-
  private:
   void GetInitialDataCallback(std::string oauth_token, int num_tokens,
                               ProxyLayer proxy_layer,