Revert r17907 - Make it possible to add more than one piece of embedder data to isolates

src/isolate.cc

 // 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 1702 matching lines @@
              reinterpret_cast<void*>(this), id());                      \
     }                                                                   \
   } while (false)
 #else
 #define TRACE_ISOLATE(tag)
 #endif
 
 
 Isolate::Isolate()
     : state_(UNINITIALIZED),
+      embedder_data_(NULL),
       entry_stack_(NULL),
       stack_trace_nesting_level_(0),
       incomplete_message_(NULL),
       preallocated_memory_thread_(NULL),
       preallocated_message_space_(NULL),
       bootstrapper_(NULL),
       runtime_profiler_(NULL),
       compilation_cache_(NULL),
       counters_(NULL),
       code_range_(NULL),
@@ skipping 792 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal