Disable using the Spelling service when spellchecking text on Mac.

chrome/browser/spellchecker/spelling_service_client.cc

Index: chrome/browser/spellchecker/spelling_service_client.cc
===================================================================
--- chrome/browser/spellchecker/spelling_service_client.cc	(revision 144326)
+++ chrome/browser/spellchecker/spelling_service_client.cc	(working copy)
@@ -124,7 +124,11 @@
   // by the suggest service. That is, it is not useful to use the suggest
   // service when this client can use the spellcheck service.
   std::string locale = pref->GetString(prefs::kSpellCheckDictionary);
+#if defined(OS_MACOSX)
+  bool spellcheck_available = locale.empty();
+#else
   bool spellcheck_available = locale.empty() || !locale.compare(0, 2, "en");
+#endif
   return type == SUGGEST ? !spellcheck_available : spellcheck_available;
 }