clang/win: Try to fix 64-bit build after https://codereview.chromium.org/1261953003.

tools/gn/exec_process_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 "base/command_line.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/strings/string_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/exec_process.h"
 
 #if defined(OS_WIN)
 #include "base/strings/utf_string_conversions.h"
 #endif
 
 namespace internal {
 
+// TODO(cjhopman): Enable these tests when windows ExecProcess handles stderr.
+// 'python' is not runnable on Windows. Adding ["cmd", "/c"] fails because
+// CommandLine does unusual reordering of args.
+#if !defined(OS_WIN)
 namespace {
 bool ExecPython(const std::string& command,
                 std::string* std_out,
                 std::string* std_err,
                 int* exit_code) {
   base::ScopedTempDir temp_dir;
   base::CommandLine::StringVector args;
 #if defined(OS_WIN)
   args.push_back(L"python");
   args.push_back(L"-c");
   args.push_back(base::UTF8ToUTF16(command));
 #else
   args.push_back("python");
   args.push_back("-c");
   args.push_back(command);
 #endif
   return ExecProcess(
       base::CommandLine(args), temp_dir.path(), std_out, std_err, exit_code);
 }
 }  // namespace
 
-// TODO(cjhopman): Enable these tests when windows ExecProcess handles stderr.
-// 'python' is not runnable on Windows. Adding ["cmd", "/c"] fails because
-// CommandLine does unusual reordering of args.
-#if !defined(OS_WIN)
 TEST(ExecProcessTest, TestExitCode) {
   std::string std_out, std_err;
   int exit_code;
 
   ASSERT_TRUE(
       ExecPython("import sys; sys.exit(0)", &std_out, &std_err, &exit_code));
   EXPECT_EQ(0, exit_code);
 
   ASSERT_TRUE(
       ExecPython("import sys; sys.exit(1)", &std_out, &std_err, &exit_code));
@@ skipping 67 matching lines @@
       "import sys; sys.stdout.close(); print >>sys.stderr, 'e' * 10000",
       &std_out,
       &std_err,
       &exit_code));
   EXPECT_EQ(0, exit_code);
   EXPECT_EQ(0u, std_out.size());
   EXPECT_EQ(10001u, std_err.size());
 }
 #endif
 }  // namespace internal