Merge ENCRYPTION_FIRST_ESTABLISHED and ENCRYPTION_REESTABLISHED events

The ENCRYPTION_FIRST_ESTABLISHED event is only sent from
MockCryptoClientStream. This CL changes it to ENCRYPTION_REESTABLISHED
to allow for a quiche merge to remove the ENCRYPTION_FIRST_ESTABLISHED
value.

Change-Id: I75bf180ef9d07feb9c4f8beb41fe7c691e7072fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752119
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687388}

net/quic/mock_crypto_client_stream.cc

@@ -134,8 +134,7 @@ bool MockCryptoClientStream::CryptoConnect() {
             QuicMakeUnique<NullEncrypter>(Perspective::IS_CLIENT));
       }
       session()->connection()->SetDefaultEncryptionLevel(ENCRYPTION_ZERO_RTT);
-      session()->OnCryptoHandshakeEvent(
-          QuicSession::ENCRYPTION_FIRST_ESTABLISHED);
+      session()->OnCryptoHandshakeEvent(QuicSession::ENCRYPTION_REESTABLISHED);
       break;
     }