Add language_prefs namespace to language_preferences.h.

chrome/browser/chromeos/dom_ui/language_hangul_options_handler.cc

Index: chrome/browser/chromeos/dom_ui/language_hangul_options_handler.cc
diff --git a/chrome/browser/chromeos/dom_ui/language_hangul_options_handler.cc b/chrome/browser/chromeos/dom_ui/language_hangul_options_handler.cc
index f645cf5ac069231644c55831dd12910073c1d194..df877d196541bdf230732c0a2efddd41de68d2e2 100644
--- a/chrome/browser/chromeos/dom_ui/language_hangul_options_handler.cc
+++ b/chrome/browser/chromeos/dom_ui/language_hangul_options_handler.cc
@@ -30,12 +30,12 @@ void LanguageHangulOptionsHandler::GetLocalizedValues(
 
 ListValue* LanguageHangulOptionsHandler::GetKeyboardLayoutList() {
   ListValue* keyboard_layout_list = new ListValue();
-  for (size_t i = 0; i < kNumHangulKeyboardNameIDPairs; ++i) {
+  for (size_t i = 0; i < language_prefs::kNumHangulKeyboardNameIDPairs; ++i) {
     ListValue* option = new ListValue();
     option->Append(Value::CreateStringValue(
-        kHangulKeyboardNameIDPairs[i].keyboard_id));
+        language_prefs::kHangulKeyboardNameIDPairs[i].keyboard_id));
     option->Append(Value::CreateStringValue(l10n_util::GetStringUTF16(
-        kHangulKeyboardNameIDPairs[i].message_id)));
+        language_prefs::kHangulKeyboardNameIDPairs[i].message_id)));
     keyboard_layout_list->Append(option);
   }
   return keyboard_layout_list;