Rename GetAcceptChValueForOrigin() to GetAcceptChValueForHostname().

Also rename argument |origin| to |hostname|.  This is all to reflect that
ACCEPT_CH value depends only on hostname, not scheme or port (the other two
components of origin), and argument is the serialization of the hostname, not
the entire origin.

PiperOrigin-RevId: 381527575
diff --git a/quic/core/tls_server_handshaker.cc b/quic/core/tls_server_handshaker.cc
index 3575fa0..65b9c3a 100644
--- a/quic/core/tls_server_handshaker.cc
+++ b/quic/core/tls_server_handshaker.cc
@@ -504,8 +504,8 @@
   TlsHandshaker::SetWriteSecret(level, cipher, write_secret);
 }
 
-std::string TlsServerHandshaker::GetAcceptChValueForOrigin(
-    const std::string& /*origin*/) const {
+std::string TlsServerHandshaker::GetAcceptChValueForHostname(
+    const std::string& /*hostname*/) const {
   return {};
 }
 
@@ -1013,7 +1013,7 @@
   const uint8_t* alps_data = nullptr;
 
   const std::string& hostname = crypto_negotiated_params_->sni;
-  std::string accept_ch_value = GetAcceptChValueForOrigin(hostname);
+  std::string accept_ch_value = GetAcceptChValueForHostname(hostname);
   std::string origin = absl::StrCat("https://", hostname);
 
   if (!accept_ch_value.empty()) {
diff --git a/quic/core/tls_server_handshaker.h b/quic/core/tls_server_handshaker.h
index f1decb7..bec09a1 100644
--- a/quic/core/tls_server_handshaker.h
+++ b/quic/core/tls_server_handshaker.h
@@ -82,10 +82,10 @@
                       const SSL_CIPHER* cipher,
                       const std::vector<uint8_t>& write_secret) override;
 
-  // Called with normalized SNI hostname as |origin|.  Return value will be sent
-  // in an ACCEPT_CH frame in the TLS ALPS extension, unless empty.
-  virtual std::string GetAcceptChValueForOrigin(
-      const std::string& origin) const;
+  // Called with normalized SNI hostname as |hostname|.  Return value will be
+  // sent in an ACCEPT_CH frame in the TLS ALPS extension, unless empty.
+  virtual std::string GetAcceptChValueForHostname(
+      const std::string& hostname) const;
 
  protected:
   // Creates a proof source handle for selecting cert and computing signature.