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

net/tools/quic/quic_server_test.cc

Index: net/tools/quic/quic_server_test.cc
diff --git a/net/tools/quic/quic_server_test.cc b/net/tools/quic/quic_server_test.cc
index 20724be2fcb7968e901964b9518b1abaac242592..4f47b20222e65acf7cd9588a0108347be6f3f6d9 100644
--- a/net/tools/quic/quic_server_test.cc
+++ b/net/tools/quic/quic_server_test.cc
@@ -187,9 +187,9 @@ TEST_F(QuicServerDispatchPacketTest, DispatchPacket) {
     0x00
   };
   // clang-format on
-  QuicReceivedPacket encrypted_valid_packet(QuicUtils::AsChars(valid_packet),
-                                            arraysize(valid_packet),
-                                            QuicTime::Zero(), false);
+  QuicReceivedPacket encrypted_valid_packet(
+      reinterpret_cast<char*>(valid_packet), arraysize(valid_packet),
+      QuicTime::Zero(), false);
 
   EXPECT_CALL(dispatcher_, ProcessPacket(_, _, _)).Times(1);
   DispatchPacket(encrypted_valid_packet);