Revert of Internalize strings in-place

src/profiler/heap-snapshot-generator.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/profiler/heap-snapshot-generator.h"
 
 #include "src/code-stubs.h"
 #include "src/conversions.h"
 #include "src/debug/debug.h"
 #include "src/objects-body-descriptors.h"
@@ skipping 1147 matching lines @@
   if (string->IsConsString()) {
     ConsString* cs = ConsString::cast(string);
     SetInternalReference(cs, entry, "first", cs->first(),
                          ConsString::kFirstOffset);
     SetInternalReference(cs, entry, "second", cs->second(),
                          ConsString::kSecondOffset);
   } else if (string->IsSlicedString()) {
     SlicedString* ss = SlicedString::cast(string);
     SetInternalReference(ss, entry, "parent", ss->parent(),
                          SlicedString::kParentOffset);
-  } else if (string->IsThinString()) {
-    ThinString* ts = ThinString::cast(string);
-    SetInternalReference(ts, entry, "actual", ts->actual(),
-                         ThinString::kActualOffset);
   }
 }
 
 
 void V8HeapExplorer::ExtractSymbolReferences(int entry, Symbol* symbol) {
   SetInternalReference(symbol, entry,
                        "name", symbol->name(),
                        Symbol::kNameOffset);
 }
 
@@ skipping 1933 matching lines @@
   for (int i = 1; i < sorted_strings.length(); ++i) {
     writer_->AddCharacter(',');
     SerializeString(sorted_strings[i]);
     if (writer_->aborted()) return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8