Be explicit about not wanting a trigraph.

sandbox/win/src/win_utils_unittest.cc

Index: sandbox/win/src/win_utils_unittest.cc
diff --git a/sandbox/win/src/win_utils_unittest.cc b/sandbox/win/src/win_utils_unittest.cc
index 569acff731d4fb8da18f1d1f00e05d5334dbbe30..4cf59b85eb6ff14eca0e7713dc60b87cc3f4d72e 100644
--- a/sandbox/win/src/win_utils_unittest.cc
+++ b/sandbox/win/src/win_utils_unittest.cc
@@ -100,7 +100,9 @@ TEST(WinUtils, IsPipe) {
   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";