gn: Remove obsolete comment about gyp command.

tools/gn/command_gen.cc

 // 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.
 
 #include "base/atomicops.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/timer/elapsed_timer.h"
 #include "tools/gn/build_settings.h"
@@ skipping 71 matching lines @@
     "  Generates ninja files from the current tree and puts them in the given\n"
     "  output directory.\n"
     "\n"
     "  The output directory can be a source-repo-absolute path name such as:\n"
     "      //out/foo\n"
     "  Or it can be a directory relative to the current directory such as:\n"
     "      out/foo\n"
     "\n"
     "  See \"gn help\" for the common command-line switches.\n";
 
-// Note: partially duplicated in command_gyp.cc.
 int RunGen(const std::vector<std::string>& args) {
   base::ElapsedTimer timer;
 
   if (args.size() != 1) {
     Err(Location(), "Need exactly one build directory to generate.",
         "I expected something more like \"gn gen out/foo\"\n"
         "You can also see \"gn help gen\".").PrintToStdout();
     return 1;
   }
 
@@ skipping 33 matching lines @@
             setup->scheduler().input_file_manager()->GetInputFileCount()) +
         " files in " +
         base::IntToString(elapsed_time.InMilliseconds()) + "ms\n";
     OutputString(stats);
   }
 
   return 0;
 }
 
 }  // namespace commands