GN: don't write separate files for non-binary targets

tools/gn/ninja_toolchain_writer_unittest.cc

 // Copyright 2014 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_toolchain_writer.h"
 #include "tools/gn/test_with_scope.h"
 
 TEST(NinjaToolchainWriter, WriteToolRule) {
   TestWithScope setup;
 
-  //Target target(setup.settings(), Label(SourceDir("//foo/"), "target"));
-  //target.set_output_type(Target::EXECUTABLE);
-  //target.SetToolchain(setup.toolchain());
-
   std::ostringstream stream;
-
-  NinjaToolchainWriter writer(setup.settings(), setup.toolchain(),
-                              std::vector<const Target*>(), stream);
+  NinjaToolchainWriter writer(setup.settings(), setup.toolchain(), stream);
   writer.WriteToolRule(Toolchain::TYPE_CC,
                        setup.toolchain()->GetTool(Toolchain::TYPE_CC),
                        std::string("prefix_"));
 
   EXPECT_EQ(
       "rule prefix_cc\n"
       "  command = cc ${in} ${cflags} ${cflags_c} ${defines} ${include_dirs} "
           "-o ${out}\n",
       stream.str());
 }