[mac] Send the system spellchecker language to the renderer.

chrome/browser/spellchecker/spellcheck_service.cc

Index: chrome/browser/spellchecker/spellcheck_service.cc
diff --git a/chrome/browser/spellchecker/spellcheck_service.cc b/chrome/browser/spellchecker/spellcheck_service.cc
index 7943c1d267006292c7d8433270d7299dcb7e34f1..a16fca43c9e64cea336b6f4131ce79a1f5bbc46a 100644
--- a/chrome/browser/spellchecker/spellcheck_service.cc
+++ b/chrome/browser/spellchecker/spellcheck_service.cc
@@ -48,6 +48,12 @@ SpellcheckService::SpellcheckService(content::BrowserContext* context)
   StringListPrefMember dictionaries_pref;
   dictionaries_pref.Init(prefs::kSpellCheckDictionaries, prefs);
   std::string first_of_dictionaries;
+
+#if defined(USE_BROWSER_SPELLCHECKER)
+  dictionaries_pref.SetValue(std::vector<std::string>(
+      1, spellcheck_platform::GetSpellCheckerLanguage()));
+  first_of_dictionaries = dictionaries_pref.GetValue().front();

[groby-ooo-7-16, 2016/01/26 01:30:10]

Can you add a short explanation what either code swath actually does? Or
possible move the migration part into a MigratePreferences? It's hard to intuit
why we need either 30 lines or 3 :)

[please use gerrit instead, 2016/01/26 20:54:34]

Done.

+#else
   if (!dictionaries_pref.GetValue().empty())
     first_of_dictionaries = dictionaries_pref.GetValue().front();
 
@@ -80,6 +86,7 @@ SpellcheckService::SpellcheckService(content::BrowserContext* context)
     dictionaries_pref.SetValue(
         std::vector<std::string>(1, first_of_dictionaries));
   }
+#endif  // defined(USE_BROWSER_SPELLCHECKER)
 
   std::string language_code;
   std::string country_code;