mac: Delete more 10.5-only code

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index ec389ed95b701abb88eb8e843df0c7b024438969..3fa64e0036cbabe34a91f50150244ce4d7238098 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -2034,10 +2034,4 @@ const char kNetworkProfileWarningsLeft[] = "network_profile.warnings_left";
 const char kNetworkProfileLastWarningTime[] =
     "network_profile.last_warning_time";
 
-#if defined(OS_MACOSX)
-// A timestamp of when the obsolete OS infobar was last shown to a user on 10.5.
-const char kMacLeopardObsoleteInfobarLastShown[] =
-    "mac_105_obsolete_infobar_last_shown";
-#endif  // defined(OS_MACOSX)
-
 }  // namespace prefs