Add initial version of retainers heap profile.

src/heap.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
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 };
 
 class DisableAssertNoAllocation {
  public:
   DisableAssertNoAllocation() { }
   ~DisableAssertNoAllocation() { }
 };
 
 #endif
 
-#ifdef ENABLE_LOGGING_AND_PROFILING
-// The HeapProfiler writes data to the log files, which can be postprocessed
-// to generate .hp files for use by the GHC/Valgrind tool hp2ps.
-class HeapProfiler {
- public:
-  // Write a single heap sample to the log file.
-  static void WriteSample();
-
- private:
-  // Update the array info with stats from obj.
-  static void CollectStats(HeapObject* obj, HistogramInfo* info);
-};
-#endif
-
 // GCTracer collects and prints ONE line after each garbage collector
 // invocation IFF --trace_gc is used.
 
 class GCTracer BASE_EMBEDDED {
  public:
   GCTracer();
 
   ~GCTracer();
 
   // Sets the collector.
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   }
   static TranscendentalCache* caches_[kNumberOfCaches];
   Element elements_[kCacheSize];
   Type type_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_