Be explicit about not wanting a trigraph.

sandbox/win/src/win_utils_unittest.cc

 // Copyright (c) 2011 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 <windows.h>
 
 #include "base/win/scoped_handle.h"
 #include "sandbox/win/src/win_utils.h"
 #include "sandbox/win/tests/common/test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 82 matching lines @@
 
   pipe_name = L"\\??\\pipe";
   EXPECT_FALSE(IsPipe(pipe_name));
 
   pipe_name = L"\\??\\_pipe_\\mypipe";
   EXPECT_FALSE(IsPipe(pipe_name));
 
   pipe_name = L"\\??\\ABCD\\mypipe";
   EXPECT_FALSE(IsPipe(pipe_name));
 
-  pipe_name = L"/??/pipe/mypipe";
+
+  // Written as two strings to prevent trigraph '?' '?' '/'.
+  pipe_name = L"/?" L"?/pipe/mypipe";
   EXPECT_FALSE(IsPipe(pipe_name));
 
   pipe_name = L"\\XX\\pipe\\mypipe";
   EXPECT_FALSE(IsPipe(pipe_name));
 
   pipe_name = L"\\Device\\NamedPipe\\mypipe";
   EXPECT_FALSE(IsPipe(pipe_name));
 }