mac: Delete more 10.5-only code

base/mac/mac_util.mm

Index: base/mac/mac_util.mm
diff --git a/base/mac/mac_util.mm b/base/mac/mac_util.mm
index 0d8fe630a27d30b6744712885e6c2ea1120c8e06..f6aeebef05fabeff4f8aa62a277806b856a42619 100644
--- a/base/mac/mac_util.mm
+++ b/base/mac/mac_util.mm
@@ -560,7 +560,6 @@ int MacOSXMinorVersion() {
 }
 
 enum {
-  LEOPARD_MINOR_VERSION = 5,
   SNOW_LEOPARD_MINOR_VERSION = 6,
   LION_MINOR_VERSION = 7,
   MOUNTAIN_LION_MINOR_VERSION = 8,
@@ -568,18 +567,6 @@ enum {
 
 }  // namespace
 
-#if !defined(BASE_MAC_MAC_UTIL_H_INLINED_GE_10_6)
-bool IsOSLeopard() {
-  return MacOSXMinorVersion() == LEOPARD_MINOR_VERSION;
-}
-#endif
-
-#if !defined(BASE_MAC_MAC_UTIL_H_INLINED_GE_10_6)
-bool IsOSLeopardOrEarlier() {
-  return MacOSXMinorVersion() <= LEOPARD_MINOR_VERSION;
-}
-#endif
-
 #if !defined(BASE_MAC_MAC_UTIL_H_INLINED_GE_10_7)
 bool IsOSSnowLeopard() {
   return MacOSXMinorVersion() == SNOW_LEOPARD_MINOR_VERSION;