Remove support for Mac OS X Leopard (10.5)

Source/wtf/unicode/icu/CollatorICU.cpp

Index: Source/wtf/unicode/icu/CollatorICU.cpp
diff --git a/Source/wtf/unicode/icu/CollatorICU.cpp b/Source/wtf/unicode/icu/CollatorICU.cpp
index 12b36b6072224aca94bff9470fa590ae6b85541c..ab950cdbcc8bdae844fb62f0f01e4f835de1e5d7 100644
--- a/Source/wtf/unicode/icu/CollatorICU.cpp
+++ b/Source/wtf/unicode/icu/CollatorICU.cpp
@@ -62,13 +62,8 @@ PassOwnPtr<Collator> Collator::userDefault()
 {
 #if OS(DARWIN) && USE(CF)
     // Mac OS X doesn't set UNIX locale to match user-selected one, so ICU default doesn't work.
-#if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
     RetainPtr<CFLocaleRef> currentLocale(AdoptCF, CFLocaleCopyCurrent());
     CFStringRef collationOrder = (CFStringRef)CFLocaleGetValue(currentLocale.get(), kCFLocaleCollatorIdentifier);
-#else
-    RetainPtr<CFStringRef> collationOrderRetainer(AdoptCF, (CFStringRef)CFPreferencesCopyValue(CFSTR("AppleCollationOrder"), kCFPreferencesAnyApplication, kCFPreferencesCurrentUser, kCFPreferencesAnyHost));
-    CFStringRef collationOrder = collationOrderRetainer.get();
-#endif
     char buf[256];
     if (!collationOrder)
         return adoptPtr(new Collator(""));