Remove QuicUtils::AsChars by casting directly. No behavior change.

net/quic/core/quic_crypto_client_stream_test.cc

Index: net/quic/core/quic_crypto_client_stream_test.cc
diff --git a/net/quic/core/quic_crypto_client_stream_test.cc b/net/quic/core/quic_crypto_client_stream_test.cc
index b6bbf6424b690bf70fafe8c1593d8e18eae303ae..c81c6b7fcefae84ccea53c055ddcdaddcb3f6bf2 100644
--- a/net/quic/core/quic_crypto_client_stream_test.cc
+++ b/net/quic/core/quic_crypto_client_stream_test.cc
@@ -227,7 +227,8 @@ TEST_F(QuicCryptoClientStreamTest, ServerConfigUpdate) {
   const string& cached_scfg = state->server_config();
   test::CompareCharArraysWithHexError(
       "scfg", cached_scfg.data(), cached_scfg.length(),
-      QuicUtils::AsChars(scfg), arraysize(scfg));
+      reinterpret_cast<char*>(scfg), arraysize(scfg));
+
   QuicStreamSequencer* sequencer = QuicStreamPeer::sequencer(stream());
   EXPECT_NE(FLAGS_quic_release_crypto_stream_buffer,
             QuicStreamSequencerPeer::IsUnderlyingBufferAllocated(sequencer));