[Local NTP] Cleanup: Remove a bunch of dead code

chrome/browser/search/local_ntp_source.cc

Index: chrome/browser/search/local_ntp_source.cc
diff --git a/chrome/browser/search/local_ntp_source.cc b/chrome/browser/search/local_ntp_source.cc
index 96bd7c63e8c1b9da4488b4becf152ef2e8afc2fc..9377dc5d6ebdf5ac89522645e49ed24d7034dee6 100644
--- a/chrome/browser/search/local_ntp_source.cc
+++ b/chrome/browser/search/local_ntp_source.cc
@@ -97,6 +97,8 @@ void AddString(base::DictionaryValue* dictionary,
 
 // Adds a localized string for the Google searchbox placeholder text.
 void AddGoogleSearchboxPlaceholderString(base::DictionaryValue* dictionary) {
+  // TODO(treib): Remove the param from the string; it's only ever used with
+  // "Google".
   base::string16 placeholder = l10n_util::GetStringFUTF16(
       IDS_SEARCH_BOX_EMPTY_HINT,
       base::ASCIIToUTF16("Google"));