Use UTF-8 rather than UNICODE for the OpenFile w/ character set test.

base/files/file_util_unittest.cc

Index: base/files/file_util_unittest.cc
diff --git a/base/files/file_util_unittest.cc b/base/files/file_util_unittest.cc
index 5c918f88880e922d59ef24478d66701445bfad29..84a7a45bad82bae646960e504a1d3655b9bd4c25 100644
--- a/base/files/file_util_unittest.cc
+++ b/base/files/file_util_unittest.cc
@@ -1744,7 +1744,7 @@ TEST_F(FileUtilTest, GetTempDirTest) {
 TEST_F(FileUtilTest, OpenFileNoInheritance) {
   FilePath file_path(temp_dir_.GetPath().Append(FPL("a_file")));
 
-  for (const char* mode : {"wb", "r,ccs=UNICODE"}) {
+  for (const char* mode : {"wb", "r,ccs=UTF-8"}) {
     SCOPED_TRACE(mode);
     ASSERT_NO_FATAL_FAILURE(CreateTextFile(file_path, L"Geepers"));
     FILE* file = OpenFile(file_path, mode);