Fix GN unit tests

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/test_with_scope.h"
 
@@ skipping 10 matching lines @@
 
   // Source set itself.
   {
     std::ostringstream out;
     NinjaBinaryTargetWriter writer(&target, out);
     writer.Run();
 
     // TODO(brettw) I think we'll need to worry about backslashes here
     // depending if we're on actual Windows or Linux pretending to be Windows.
     const char expected_win[] =
-        "arch = environment.x86\n"
         "defines =\n"
         "includes =\n"
         "cflags =\n"
         "cflags_c =\n"
         "cflags_cc =\n"
         "cflags_objc =\n"
         "cflags_objcc =\n"
         "\n"
         "build obj/foo/bar.input1.obj: tc_cxx ../../foo/input1.cc\n"
         "build obj/foo/bar.input2.obj: tc_cxx ../../foo/input2.cc\n"
@@ skipping 13 matching lines @@
   shlib_target.OnResolved();
 
   {
     std::ostringstream out;
     NinjaBinaryTargetWriter writer(&shlib_target, out);
     writer.Run();
 
     // TODO(brettw) I think we'll need to worry about backslashes here
     // depending if we're on actual Windows or Linux pretending to be Windows.
     const char expected_win[] =
-        "arch = environment.x86\n"
         "defines =\n"
         "includes =\n"
         "cflags =\n"
         "cflags_c =\n"
         "cflags_cc =\n"
         "cflags_objc =\n"
         "cflags_objcc =\n"
         "\n"
         "\n"
         "manifests = obj/foo/shlib.intermediate.manifest\n"
         "ldflags = /MANIFEST /ManifestFile:obj/foo/shlib.intermediate.manifest\n"
         "libs =\n"
         "build shlib.dll shlib.dll.lib: tc_solink obj/foo/bar.input1.obj obj/foo/bar.input2.obj\n"
         "  soname = shlib.dll\n"
         "  lib = shlib.dll\n"
         "  dll = shlib.dll\n"
         "  implibflag = /IMPLIB:shlib.dll.lib\n\n";
     std::string out_str = out.str();
 #if defined(OS_WIN)
     std::replace(out_str.begin(), out_str.end(), '\\', '/');
 #endif
     EXPECT_EQ(expected_win, out_str);
   }
 }