Remove support for Live Object List and inspector module.

src/heap.h

 // Copyright 2012 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 2822 matching lines @@
   static int SizeOfMarkedObject(HeapObject* object) {
     return object->SizeFromMap(MapOfMarkedObject(object));
   }
 
  private:
   static const uintptr_t kNotMarkedBit = 0x1;
   STATIC_ASSERT((kHeapObjectTag & kNotMarkedBit) != 0);
 };
 
 
-#if defined(DEBUG) || defined(LIVE_OBJECT_LIST)
+#ifdef DEBUG
 // Helper class for tracing paths to a search target Object from all roots.
 // The TracePathFrom() method can be used to trace paths from a specific
 // object to the search target object.
 class PathTracer : public ObjectVisitor {
  public:
   enum WhatToFind {
     FIND_ALL,   // Will find all matches.
     FIND_FIRST  // Will stop the search after first match.
   };
 
@@ skipping 36 matching lines @@
   bool found_target_in_trace_;
   WhatToFind what_to_find_;
   VisitMode visit_mode_;
   List<Object*> object_stack_;
 
   AssertNoAllocation no_alloc;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
-#endif  // DEBUG || LIVE_OBJECT_LIST
+#endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_