GN: Don't write stamp files for one rule.

tools/gn/ninja_action_target_writer_unittest.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 <algorithm>
 #include <sstream>
 
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/ninja_action_target_writer.h"
@@ skipping 331 matching lines @@
       "rule __foo_bar___rule\n"
       // This name is autogenerated from the target rule name.
       "  rspfile = __foo_bar___rule.$unique_name.rsp\n"
       // These come from rsp_file_contents above.
       "  rspfile_content = -j ${source_name_part}\n"
       // These come from the args.
       "  command = /usr/bin/python ../../foo/script.py ${in} "
           "${source_file_part} ${rspfile}\n"
       "  description = ACTION //foo:bar()\n"
       "  restat = 1\n"
-      "build obj/foo/bar.inputdeps.stamp: stamp ../../foo/script.py\n"
       "\n"
       "build input1.out: __foo_bar___rule ../../foo/input1.txt"
-          " | obj/foo/bar.inputdeps.stamp\n"
+          " | ../../foo/script.py\n"
       // Necessary for the rspfile defined in the rule.
       "  unique_name = 0\n"
       // Substitution for the args.
       "  source_file_part = input1.txt\n"
       // Substitution for the rspfile contents.
       "  source_name_part = input1\n"
       "\n"
       "build obj/foo/bar.stamp: stamp input1.out\n";
   EXPECT_EQ(expected_linux, out.str());
 }