Remove GN GYP generator.

tools/gn/commands.h

 // Copyright (c) 2013 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.
 
 #ifndef TOOLS_GN_COMMANDS_H_
 #define TOOLS_GN_COMMANDS_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 16 matching lines @@
 extern const char kDesc[];
 extern const char kDesc_HelpShort[];
 extern const char kDesc_Help[];
 int RunDesc(const std::vector<std::string>& args);
 
 extern const char kGen[];
 extern const char kGen_HelpShort[];
 extern const char kGen_Help[];
 int RunGen(const std::vector<std::string>& args);
 
-extern const char kGyp[];
-extern const char kGyp_HelpShort[];
-extern const char kGyp_Help[];
-int RunGyp(const std::vector<std::string>& args);
-
 extern const char kHelp[];
 extern const char kHelp_HelpShort[];
 extern const char kHelp_Help[];
 int RunHelp(const std::vector<std::string>& args);
 
 extern const char kRefs[];
 extern const char kRefs_HelpShort[];
 extern const char kRefs_Help[];
 int RunRefs(const std::vector<std::string>& args);
 
@@ skipping 21 matching lines @@
 //
 // Note that a lot of memory is leaked to avoid proper teardown under the
 // assumption that you will only run this once and exit.
 //
 // On failure, prints an error message and returns NULL.
 const Target* GetTargetForDesc(const std::vector<std::string>& args);
 
 }  // namespace commands
 
 #endif  // TOOLS_GN_COMMANDS_H_