Fix include guards for QUIC files.

net/quic/core/quic_stream_sequencer_buffer.h

Index: net/quic/core/quic_stream_sequencer_buffer.h
diff --git a/net/quic/core/quic_stream_sequencer_buffer.h b/net/quic/core/quic_stream_sequencer_buffer.h
index 930dbd5fa42389f61ac773e5fa676ed99c8742c5..33ca5211cfa314ec4e02d8786f5031414e7b7005 100644
--- a/net/quic/core/quic_stream_sequencer_buffer.h
+++ b/net/quic/core/quic_stream_sequencer_buffer.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NET_QUIC_QUIC_STREAM_SEQUENCER_BUFFER_H_
-#define NET_QUIC_QUIC_STREAM_SEQUENCER_BUFFER_H_
+#ifndef NET_QUIC_CORE_QUIC_STREAM_SEQUENCER_BUFFER_H_
+#define NET_QUIC_CORE_QUIC_STREAM_SEQUENCER_BUFFER_H_
 
 // QuicStreamSequencerBuffer implements QuicStreamSequencerBufferInterface.
 // It is a circular stream buffer with random write and
@@ -257,4 +257,4 @@ class NET_EXPORT_PRIVATE QuicStreamSequencerBuffer {
 };
 }  // namespace net
 
-#endif  // NET_QUIC_QUIC_STREAM_SEQUENCER_BUFFER_H_
+#endif  // NET_QUIC_CORE_QUIC_STREAM_SEQUENCER_BUFFER_H_