Revert of [es6] Map/Set size getter should have "get size" name

src/runtime/runtime-function.cc

 // Copyright 2014 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/v8.h"
 
 #include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/cpu-profiler.h"
@@ skipping 64 matching lines @@
   if (name->IsSymbol()) {
     Handle<Object> description(Handle<Symbol>::cast(name)->name(),
                                name->GetIsolate());
     if (description->IsString()) {
       stringName = Handle<String>::cast(description);
     }
   } else {
     stringName = Handle<String>::cast(name);
   }
 
-  return String::Flatten(stringName);
+  return stringName;
 }
 
 
 RUNTIME_FUNCTION(Runtime_FunctionSetName) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
 
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, f, 0);
   CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
 
@@ skipping 546 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_IsFunction) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(Object, obj, 0);
   return isolate->heap()->ToBoolean(obj->IsJSFunction());
 }
 }
 }  // namespace v8::internal