StringImpl should not be referred from StringImplCF.

Source/platform/text/LocaleMac.mm

Index: Source/platform/text/LocaleMac.mm
diff --git a/Source/platform/text/LocaleMac.mm b/Source/platform/text/LocaleMac.mm
index 48cad200c9178761b7678ce752347d8a9229ac9e..8a462d1695b33d6eb2f9feb49b7e061a1e9d812b 100644
--- a/Source/platform/text/LocaleMac.mm
+++ b/Source/platform/text/LocaleMac.mm
@@ -88,8 +88,11 @@ LocaleMac::LocaleMac(NSLocale* locale)
     NSArray* availableLanguages = [NSLocale ISOLanguageCodes];
     // NSLocale returns a lower case NSLocaleLanguageCode so we don't have care about case.
     NSString* language = [m_locale.get() objectForKey:NSLocaleLanguageCode];
-    if ([availableLanguages indexOfObject:language] == NSNotFound)
-        m_locale.adoptNS([[NSLocale alloc] initWithLocaleIdentifier:defaultLanguage()]);
+    if ([availableLanguages indexOfObject:language] == NSNotFound) {
+        NSString *nsLanguage = [[NSString alloc] initWithUTF8String:defaultLanguage().utf8().data()];
+        m_locale.adoptNS([[NSLocale alloc] initWithLocaleIdentifier:nsLanguage]);
+        [nsLanguage release];
+    }
     [m_gregorianCalendar.get() setLocale:m_locale.get()];
 }