If user profile doesn't contain language setting, default to his Google account settings.

chrome/browser/chromeos/login/fake_user_manager.cc

Index: chrome/browser/chromeos/login/fake_user_manager.cc
diff --git a/chrome/browser/chromeos/login/fake_user_manager.cc b/chrome/browser/chromeos/login/fake_user_manager.cc
index 3b027dc03dc4953bda68c525e951526e1fb2dc34..2546474e059571e71b216edbe44cba3b9d8e92a9 100644
--- a/chrome/browser/chromeos/login/fake_user_manager.cc
+++ b/chrome/browser/chromeos/login/fake_user_manager.cc
@@ -84,6 +84,11 @@ void FakeUserManager::SaveUserDisplayName(
   }
 }
 
+void FakeUserManager::UpdateUserAccountData(const std::string&, const string16&,
+                           const std::string&) {
+  // Not implemented
+}
+
 UserImageManager* FakeUserManager::GetUserImageManager() {
   return NULL;
 }