Deprecate more old filepath functions.

base/file_util_unittest.cc

Index: base/file_util_unittest.cc
diff --git a/base/file_util_unittest.cc b/base/file_util_unittest.cc
index 39e5398cb2f0f9cdd0def3dcc918730e46bad9a0..20f9c9829191d9aa61180ae7bfe019e2f063cf55 100644
--- a/base/file_util_unittest.cc
+++ b/base/file_util_unittest.cc
@@ -325,6 +325,8 @@ static const struct filename_case {
 #endif
 };
 
+#if defined(OS_WIN)
+// This function is deprecated on non-Windows.
 TEST_F(FileUtilTest, GetFilenameFromPath) {
   for (unsigned int i = 0; i < arraysize(filename_cases); ++i) {
     const filename_case& value = filename_cases[i];
@@ -332,6 +334,7 @@ TEST_F(FileUtilTest, GetFilenameFromPath) {
     EXPECT_EQ(value.filename, result);
   }
 }
+#endif
 
 // Test finding the file type from a path name
 static const struct extension_case {