Correctly name header macros for src/snapshot/*.h.

src/snapshot/serialize.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_SERIALIZE_H_
-#define V8_SERIALIZE_H_
+#ifndef V8_SNAPSHOT_SERIALIZE_H_
+#define V8_SNAPSHOT_SERIALIZE_H_
 
 #include "src/hashmap.h"
 #include "src/heap-profiler.h"
 #include "src/isolate.h"
 #include "src/snapshot/snapshot-source-sink.h"
 
 namespace v8 {
 namespace internal {
 
 class ScriptData;
@@ skipping 977 matching lines @@
   static const int kNumReservationsOffset =
       kNumInternalizedStringsOffset + kInt32Size;
   static const int kNumCodeStubKeysOffset = kNumReservationsOffset + kInt32Size;
   static const int kPayloadLengthOffset = kNumCodeStubKeysOffset + kInt32Size;
   static const int kChecksum1Offset = kPayloadLengthOffset + kInt32Size;
   static const int kChecksum2Offset = kChecksum1Offset + kInt32Size;
   static const int kHeaderSize = kChecksum2Offset + kInt32Size;
 };
 } }  // namespace v8::internal
 
-#endif  // V8_SERIALIZE_H_
+#endif  // V8_SNAPSHOT_SERIALIZE_H_