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

chrome/browser/search/local_ntp_source.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/search/local_ntp_source.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 79 matching lines @@
 
 // Adds a localized string keyed by resource id to the dictionary.
 void AddString(base::DictionaryValue* dictionary,
                const std::string& key,
                int resource_id) {
   dictionary->SetString(key, l10n_util::GetStringUTF16(resource_id));
 }
 
 // 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"));
   dictionary->SetString("searchboxPlaceholder", placeholder);
 }
 
 // Populates |translated_strings| dictionary for the local NTP. |is_google|
 // indicates that this page is the Google Local NTP.
 std::unique_ptr<base::DictionaryValue> GetTranslatedStrings(bool is_google) {
   std::unique_ptr<base::DictionaryValue> translated_strings(
@@ skipping 143 matching lines @@
     }
   }
   return false;
 }
 
 std::string LocalNtpSource::GetContentSecurityPolicyChildSrc() const {
   // Allow embedding of most visited iframes.
   return base::StringPrintf("child-src %s;",
                             chrome::kChromeSearchMostVisitedUrl);
 }