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

src/snapshot/snapshot.h

 // Copyright 2006-2008 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.
 
 #include "src/isolate.h"
 #include "src/snapshot/serialize.h"
 
-#ifndef V8_SNAPSHOT_H_
-#define V8_SNAPSHOT_H_
+#ifndef V8_SNAPSHOT_SNAPSHOT_H_
+#define V8_SNAPSHOT_SNAPSHOT_H_
 
 namespace v8 {
 namespace internal {
 
 class Snapshot : public AllStatic {
  public:
   class Metadata {
    public:
     explicit Metadata(uint32_t data = 0) : data_(data) {}
     bool embeds_script() { return EmbedsScriptBits::decode(data_); }
@@ skipping 63 matching lines @@
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Snapshot);
 };
 
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 void SetSnapshotFromFile(StartupData* snapshot_blob);
 #endif
 
 } }  // namespace v8::internal
 
-#endif  // V8_SNAPSHOT_H_
+#endif  // V8_SNAPSHOT_SNAPSHOT_H_