Remove --experimental-classes flag and related dead code.

src/objects.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 <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
@@ skipping 10370 matching lines @@
     PrintF("[disabled optimization for ");
     ShortPrint();
     PrintF(", reason: %s]\n", GetBailoutReason(reason));
   }
 }
 
 
 void SharedFunctionInfo::InitFromFunctionLiteral(
     Handle<SharedFunctionInfo> shared_info, FunctionLiteral* lit) {
   shared_info->set_length(lit->parameter_count());
-  if (FLAG_experimental_classes && IsSubclassConstructor(lit->kind())) {
+  if (IsSubclassConstructor(lit->kind())) {
     shared_info->set_internal_formal_parameter_count(lit->parameter_count() +
                                                      1);
   } else {
     shared_info->set_internal_formal_parameter_count(lit->parameter_count());
   }
   shared_info->set_function_token_position(lit->function_token_position());
   shared_info->set_start_position(lit->start_position());
   shared_info->set_end_position(lit->end_position());
   shared_info->set_is_expression(lit->is_expression());
   shared_info->set_is_anonymous(lit->is_anonymous());
@@ skipping 6612 matching lines @@
                                                CompilationInfo* info) {
   Handle<DependentCode> codes = DependentCode::InsertCompilationInfo(
       handle(cell->dependent_code(), info->isolate()),
       DependentCode::kPropertyCellChangedGroup, info->object_wrapper());
   if (*codes != cell->dependent_code()) cell->set_dependent_code(*codes);
   info->dependencies(DependentCode::kPropertyCellChangedGroup)->Add(
       cell, info->zone());
 }
 
 } }  // namespace v8::internal