Remove obsolete OS handling in GN.

tools/gn/ninja_binary_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 <sstream>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/ninja_binary_target_writer.h"
 #include "tools/gn/scheduler.h"
 #include "tools/gn/target.h"
 #include "tools/gn/test_with_scope.h"
 
 TEST(NinjaBinaryTargetWriter, SourceSet) {
   TestWithScope setup;
   Err err;
 
   setup.build_settings()->SetBuildDir(SourceDir("//out/Debug/"));
-  setup.settings()->set_target_os(Settings::WIN);
 
   Target target(setup.settings(), Label(SourceDir("//foo/"), "bar"));
   target.set_output_type(Target::SOURCE_SET);
   target.visibility().SetPublic();
   target.sources().push_back(SourceFile("//foo/input1.cc"));
   target.sources().push_back(SourceFile("//foo/input2.cc"));
   // Also test object files, which should be just passed through to the
   // dependents to link.
   target.sources().push_back(SourceFile("//foo/input3.o"));
   target.sources().push_back(SourceFile("//foo/input4.obj"));
@@ skipping 116 matching lines @@
   }
 }
 
 // This tests that output extension overrides apply, and input dependencies
 // are applied.
 TEST(NinjaBinaryTargetWriter, ProductExtensionAndInputDeps) {
   TestWithScope setup;
   Err err;
 
   setup.build_settings()->SetBuildDir(SourceDir("//out/Debug/"));
-  setup.settings()->set_target_os(Settings::LINUX);
 
   // An action for our library to depend on.
   Target action(setup.settings(), Label(SourceDir("//foo/"), "action"));
   action.set_output_type(Target::ACTION_FOREACH);
   action.visibility().SetPublic();
   action.SetToolchain(setup.toolchain());
   ASSERT_TRUE(action.OnResolved(&err));
 
   // A shared library w/ the product_extension set to a custom value.
   Target target(setup.settings(), Label(SourceDir("//foo/"), "shlib"));
@@ skipping 35 matching lines @@
 
   std::string out_str = out.str();
   EXPECT_EQ(expected, out_str);
 }
 
 TEST(NinjaBinaryTargetWriter, EmptyProductExtension) {
   TestWithScope setup;
   Err err;
 
   setup.build_settings()->SetBuildDir(SourceDir("//out/Debug/"));
-  setup.settings()->set_target_os(Settings::LINUX);
 
   // This test is the same as ProductExtension, except that
   // we call set_output_extension("") and ensure that we still get the default.
   Target target(setup.settings(), Label(SourceDir("//foo/"), "shlib"));
   target.set_output_type(Target::SHARED_LIBRARY);
   target.set_output_extension(std::string());
   target.sources().push_back(SourceFile("//foo/input1.cc"));
   target.sources().push_back(SourceFile("//foo/input2.cc"));
 
   target.SetToolchain(setup.toolchain());
@@ skipping 21 matching lines @@
       "  libs =\n"
       "  output_extension = .so\n";
 
   std::string out_str = out.str();
   EXPECT_EQ(expected, out_str);
 }
 
 TEST(NinjaBinaryTargetWriter, SourceSetDataDeps) {
   TestWithScope setup;
   setup.build_settings()->SetBuildDir(SourceDir("//out/Debug/"));
-  setup.settings()->set_target_os(Settings::LINUX);
 
   Err err;
 
   // This target is a data (runtime) dependency of the intermediate target.
   Target data(setup.settings(), Label(SourceDir("//foo/"), "data_target"));
   data.set_output_type(Target::EXECUTABLE);
   data.visibility().SetPublic();
   data.SetToolchain(setup.toolchain());
   ASSERT_TRUE(data.OnResolved(&err));
 
@@ skipping 61 matching lines @@
           "obj/foo/inter.stamp\n"
       "  ldflags =\n"
       "  libs =\n"
       "  output_extension = \n";
   EXPECT_EQ(final_expected, final_out.str());
 }
 
 TEST(NinjaBinaryTargetWriter, SharedLibraryModuleDefinitionFile) {
   TestWithScope setup;
   setup.build_settings()->SetBuildDir(SourceDir("//out/Debug/"));
-  setup.settings()->set_target_os(Settings::WIN);
 
   Target shared_lib(setup.settings(), Label(SourceDir("//foo/"), "bar"));
   shared_lib.set_output_type(Target::SHARED_LIBRARY);
   shared_lib.SetToolchain(setup.toolchain());
   shared_lib.sources().push_back(SourceFile("//foo/sources.cc"));
   shared_lib.sources().push_back(SourceFile("//foo/bar.def"));
 
   Err err;
   ASSERT_TRUE(shared_lib.OnResolved(&err));
 
@@ skipping 350 matching lines @@
 
   EXPECT_FALSE(scheduler.is_failed());
 
   std::ostringstream out;
   NinjaBinaryTargetWriter writer(&target, out);
   writer.Run();
 
   // Should have issued an error.
   EXPECT_TRUE(scheduler.is_failed());
 }