Delete some unused code found by -Wunused-function

ui/gfx/render_text_unittest.cc

Index: ui/gfx/render_text_unittest.cc
diff --git a/ui/gfx/render_text_unittest.cc b/ui/gfx/render_text_unittest.cc
index 2680800e30bc308ff9ae6d3845e52a9328b70020..402e3e66edb4f80a3e2fb69f7435979dca4c7ddb 100644
--- a/ui/gfx/render_text_unittest.cc
+++ b/ui/gfx/render_text_unittest.cc
@@ -38,6 +38,7 @@ bool IndexInRange(const ui::Range& range, size_t index) {
   return index >= range.start() && index < range.end();
 }
 
+#if !defined(OS_MACOSX)
 // A test utility function to set the application default text direction.
 void SetRTL(bool rtl) {
   // Override the current locale/direction.
@@ -48,6 +49,7 @@ void SetRTL(bool rtl) {
 #endif
   EXPECT_EQ(rtl, base::i18n::IsRTL());
 }
+#endif
 
 }  // namespace