Rename HandshakerDelegate to HandshakerInterface in QuicCryptoServerStream
and QuicCryptoClientStream to make it clear that this is an interface which
defines the handshaker as opposed to a delegate of the handshaker (Which is
defined by the similarly named HandshakerDelegateInterface).

gfe-relnote: n/a - Rename only
PiperOrigin-RevId: 286924355
Change-Id: Ifb31cf8f7afd6aa0560c599fc28cbf9c9f3655b4
diff --git a/quic/core/quic_crypto_server_handshaker.h b/quic/core/quic_crypto_server_handshaker.h
index 4e1a1b8..a2ed38a 100644
--- a/quic/core/quic_crypto_server_handshaker.h
+++ b/quic/core/quic_crypto_server_handshaker.h
@@ -21,7 +21,7 @@
 }  // namespace test
 
 class QUIC_EXPORT_PRIVATE QuicCryptoServerHandshaker
-    : public QuicCryptoServerStream::HandshakerDelegate,
+    : public QuicCryptoServerStream::HandshakerInterface,
       public QuicCryptoHandshaker {
  public:
   // |crypto_config| must outlive the stream.
@@ -38,7 +38,7 @@
 
   ~QuicCryptoServerHandshaker() override;
 
-  // From HandshakerDelegate
+  // From HandshakerInterface
   void CancelOutstandingCallbacks() override;
   bool GetBase64SHA256ClientChannelID(std::string* output) const override;
   void SendServerConfigUpdate(