gn: Remove another obsolete comment about gyp command from command_check.cc.

tools/gn/command_check.cc

 // Copyright 2014 The Chromium 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 "tools/gn/commands.h"
 #include "tools/gn/setup.h"
 #include "tools/gn/standard_out.h"
 
 namespace commands {
 
 const char kCheck[] = "check";
 const char kCheck_HelpShort[] =
     "check: Check header dependencies.";
 const char kCheck_Help[] =
     "gn check: Check header dependencies.\n"
     "\n"
     "  \"gn check\" is the same thing as \"gn gen\" with the \"--check\" flag\n"
     "  except that this command does not write out any build files. It's\n"
     "  intended to be an easy way to manually trigger include file checking.\n"
     "\n"
     "  See \"gn help\" for the common command-line switches.\n";
 
-// Note: partially duplicated in command_gyp.cc.
 int RunCheck(const std::vector<std::string>& args) {
   // Deliberately leaked to avoid expensive process teardown.
   Setup* setup = new Setup();
   // TODO(brettw) bug 343726: Use a temporary directory instead of this
   // default one to avoid messing up any build that's in there.
   if (!setup->DoSetup("//out/Default"))
     return 1;
   setup->set_check_public_headers(true);
 
   if (!setup->Run())
     return 1;
 
   OutputString("Header dependency check OK\n", DECORATION_GREEN);
   return 0;
 }
 
 }  // namespace commands