Kill some unused code.

src/log.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 143 matching lines @@
 
   // Acquires resources for logging if the right flags are set.
   static bool Setup();
 
   // Frees resources acquired in Setup.
   static void TearDown();
 
   // Enable the computation of a sliding window of states.
   static void EnableSlidingStateWindow();
 
-  // Write a raw string to the log to be used as a preamble.
-  // No check is made that the 'preamble' is actually at the beginning
-  // of the log. The preample is used to write code events saved in the
-  // snapshot.
-  static void Preamble(const char* content);
-
   // Emits an event with a string value -> (name, value).
   static void StringEvent(const char* name, const char* value);
 
   // Emits an event with an int value -> (name, value).
   static void IntEvent(const char* name, int value);
 
   // Emits an event with an handle value -> (name, location).
   static void HandleEvent(const char* name, Object** location);
 
   // Emits memory management events for C allocated structures.
@@ skipping 210 matching lines @@
 // Class that extracts stack trace, used for profiling.
 class StackTracer : public AllStatic {
  public:
   static void Trace(TickSample* sample);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOG_H_