Remove obsolete OS handling in GN.

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 "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/ninja_action_target_writer.h"
 #include "tools/gn/substitution_list.h"
@@ skipping 36 matching lines @@
 
   target.action_values().set_script(SourceFile("//foo/script.py"));
   target.inputs().push_back(SourceFile("//foo/included.txt"));
 
   target.action_values().outputs() =
       SubstitutionList::MakeForTest("//out/Debug/foo.out");
 
   target.SetToolchain(setup.toolchain());
   ASSERT_TRUE(target.OnResolved(&err));
 
-  setup.settings()->set_target_os(Settings::LINUX);
   setup.build_settings()->set_python_path(base::FilePath(FILE_PATH_LITERAL(
       "/usr/bin/python")));
 
   std::ostringstream out;
   NinjaActionTargetWriter writer(&target, out);
   writer.Run();
 
   const char expected[] =
       "rule __foo_bar___rule\n"
       "  command = /usr/bin/python ../../foo/script.py\n"
@@ skipping 21 matching lines @@
   target.action_values().set_script(SourceFile("//foo/script.py"));
   target.inputs().push_back(SourceFile("//foo/included.txt"));
 
   target.action_values().outputs() =
       SubstitutionList::MakeForTest("//out/Debug/foo.out");
   target.action_values().set_console(true);
 
   target.SetToolchain(setup.toolchain());
   ASSERT_TRUE(target.OnResolved(&err));
 
-  setup.settings()->set_target_os(Settings::LINUX);
   setup.build_settings()->set_python_path(base::FilePath(FILE_PATH_LITERAL(
       "/usr/bin/python")));
 
   std::ostringstream out;
   NinjaActionTargetWriter writer(&target, out);
   writer.Run();
 
   const char expected[] =
       "rule __foo_bar___rule\n"
       "  command = /usr/bin/python ../../foo/script.py\n"
@@ skipping 23 matching lines @@
 
   target.sources().push_back(SourceFile("//foo/source.txt"));
   target.inputs().push_back(SourceFile("//foo/included.txt"));
 
   target.action_values().outputs() =
       SubstitutionList::MakeForTest("//out/Debug/foo.out");
 
   target.SetToolchain(setup.toolchain());
   ASSERT_TRUE(target.OnResolved(&err));
 
-  setup.settings()->set_target_os(Settings::LINUX);
   setup.build_settings()->set_python_path(base::FilePath(FILE_PATH_LITERAL(
       "/usr/bin/python")));
 
   std::ostringstream out;
   NinjaActionTargetWriter writer(&target, out);
   writer.Run();
 
   const char expected_linux[] =
       "rule __foo_bar___rule\n"
       "  command = /usr/bin/python ../../foo/script.py\n"
@@ skipping 45 matching lines @@
       "{{source}}",
       "--out=foo bar{{source_name_part}}.o");
   target.action_values().outputs() = SubstitutionList::MakeForTest(
       "//out/Debug/{{source_name_part}}.out");
 
   target.inputs().push_back(SourceFile("//foo/included.txt"));
 
   target.SetToolchain(setup.toolchain());
   ASSERT_TRUE(target.OnResolved(&err));
 
-  setup.settings()->set_target_os(Settings::LINUX);
   setup.build_settings()->set_python_path(base::FilePath(FILE_PATH_LITERAL(
       "/usr/bin/python")));
 
   std::ostringstream out;
   NinjaActionTargetWriter writer(&target, out);
   writer.Run();
 
   const char expected_linux[] =
       "rule __foo_bar___rule\n"
       "  command = /usr/bin/python ../../foo/script.py -i ${in} "
@@ skipping 48 matching lines @@
 
   target.action_values().args() = SubstitutionList::MakeForTest(
       "-i",
       "{{source}}",
       "--out=foo bar{{source_name_part}}.o");
   target.action_values().outputs() = SubstitutionList::MakeForTest(
       "//out/Debug/{{source_name_part}}.out");
 
   target.inputs().push_back(SourceFile("//foo/included.txt"));
 
-  setup.settings()->set_target_os(Settings::LINUX);
   setup.build_settings()->set_python_path(base::FilePath(FILE_PATH_LITERAL(
       "/usr/bin/python")));
 
   std::ostringstream out;
   NinjaActionTargetWriter writer(&target, out);
   writer.Run();
 
   const char expected_linux[] =
       "rule __foo_bar___rule\n"
       "  command = /usr/bin/python ../../foo/script.py -i ${in} "
@@ skipping 39 matching lines @@
   target.action_values().args() = SubstitutionList::MakeForTest(
       "{{source}}",
       "{{source_file_part}}",
       "{{response_file_name}}");
   target.action_values().rsp_file_contents() = SubstitutionList::MakeForTest(
       "-j",
       "{{source_name_part}}");
   target.action_values().outputs() = SubstitutionList::MakeForTest(
       "//out/Debug/{{source_name_part}}.out");
 
-  setup.settings()->set_target_os(Settings::LINUX);
   setup.build_settings()->set_python_path(base::FilePath(FILE_PATH_LITERAL(
       "/usr/bin/python")));
 
   std::ostringstream out;
   NinjaActionTargetWriter writer(&target, out);
   writer.Run();
 
   const char expected_linux[] =
       "rule __foo_bar___rule\n"
       // This name is autogenerated from the target rule name.
@@ skipping 12 matching lines @@
       // 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());
 }