Fix another handful of memory leaks

src/isolate.cc

 // Copyright 2011 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 1555 matching lines @@
   delete logger_;
   logger_ = NULL;
 
   delete counters_;
   counters_ = NULL;
 
   delete handle_scope_implementer_;
   handle_scope_implementer_ = NULL;
   delete break_access_;
   break_access_ = NULL;
+  delete debugger_access_;
+  debugger_access_ = NULL;
 
   delete compilation_cache_;
   compilation_cache_ = NULL;
   delete bootstrapper_;
   bootstrapper_ = NULL;
   delete pc_to_code_cache_;
   pc_to_code_cache_ = NULL;
   delete write_input_buffer_;
   write_input_buffer_ = NULL;
 
@@ skipping 289 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