Show Learn more link in 3G promo bubble only if deal_info_url is not empty

BUG=chrome-os-partner:5066
TEST=manual

Review URL: http://codereview.chromium.org/7608023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96344 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/status/network_menu_button.cc

@@ -412,7 +412,7 @@ void NetworkMenuButton::ShowOptionalMobileDataPromoNotification(
 
     std::vector<std::wstring> links;
     links.push_back(UTF16ToWide(l10n_util::GetStringUTF16(link_message_id)));
-    if (!deal_topup_url_.empty())
+    if (!deal_info_url_.empty())
       links.push_back(UTF16ToWide(l10n_util::GetStringUTF16(IDS_LEARN_MORE)));
     mobile_data_bubble_ = MessageBubble::ShowWithLinks(
         GetWidget(),