Fix include guards for QUIC files.

net/quic/core/congestion_control/pacing_sender.h

Index: net/quic/core/congestion_control/pacing_sender.h
diff --git a/net/quic/core/congestion_control/pacing_sender.h b/net/quic/core/congestion_control/pacing_sender.h
index 4f6ff3cab068af5a7fe9a23621ff4f0b2c2a00ec..dceb2a01a3105a37157639646f3d321283a905de 100644
--- a/net/quic/core/congestion_control/pacing_sender.h
+++ b/net/quic/core/congestion_control/pacing_sender.h
@@ -8,8 +8,8 @@
 // alarm to ensure that alarms are not set too aggressively, and err towards
 // sending packets too early instead of too late.
 
-#ifndef NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_
-#define NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_
+#ifndef NET_QUIC_CORE_CONGESTION_CONTROL_PACING_SENDER_H_
+#define NET_QUIC_CORE_CONGESTION_CONTROL_PACING_SENDER_H_
 
 #include <stdint.h>
 
@@ -73,4 +73,4 @@ class NET_EXPORT_PRIVATE PacingSender {
 
 }  // namespace net
 
-#endif  // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_
+#endif  // NET_QUIC_CORE_CONGESTION_CONTROL_PACING_SENDER_H_