Remove sliced string string type...

src/mark-compact.cc

 // 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 554 matching lines @@
                           object->SizeFromMap(map),
                           &marker);
     }
   }
 };
 
 
 void MarkCompactCollector::MarkSymbolTable() {
   // Objects reachable from symbols are marked as live so as to ensure
   // that if the symbol itself remains alive after GC for any reason,
-  // and if it is a sliced string or a cons string backed by an
-  // external string (even indirectly), then the external string does
-  // not receive a weak reference callback.
+  // and if it is a cons string backed by an external string (even indirectly),
+  // then the external string does not receive a weak reference callback.
   SymbolTable* symbol_table = Heap::raw_unchecked_symbol_table();
   // Mark the symbol table itself.
   SetMark(symbol_table);
   // Explicitly mark the prefix.
   MarkingVisitor marker;
   symbol_table->IteratePrefix(&marker);
   ProcessMarkingStack(&marker);
   // Mark subparts of the symbols but not the symbols themselves
   // (unless reachable from another symbol).
   SymbolMarkingVisitor symbol_marker;
@@ skipping 1219 matching lines @@
 
 void MarkCompactCollector::RebuildRSets() {
 #ifdef DEBUG
   ASSERT(state_ == RELOCATE_OBJECTS);
   state_ = REBUILD_RSETS;
 #endif
   Heap::RebuildRSets();
 }
 
 } }  // namespace v8::internal