Correct const accessors in base/values.(h|cc), Part II (ListValue)

chrome/browser/ui/webui/history_ui.cc

 // Copyright (c) 2012 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/ui/webui/history_ui.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 358 matching lines @@
 
   // Notify the page that the deletion request succeeded.
   web_ui()->CallJavascriptFunction("deleteComplete");
 }
 
 void BrowsingHistoryHandler::ExtractSearchHistoryArguments(
     const ListValue* args,
     int* month,
     string16* query) {
   *month = 0;
-  Value* list_member;
+  const Value* list_member;
 
   // Get search string.
   if (args->Get(0, &list_member) &&
       list_member->GetType() == Value::TYPE_STRING) {
     const StringValue* string_value =
       static_cast<const StringValue*>(list_member);
     string_value->GetAsString(query);
   }
 
   // Get search month.
@@ skipping 101 matching lines @@
   return GURL(std::string(chrome::kChromeUIHistoryURL) + "#q=" +
               net::EscapeQueryParamValue(UTF16ToUTF8(text), true));
 }
 
 // static
 base::RefCountedMemory* HistoryUI::GetFaviconResourceBytes() {
   return ResourceBundle::GetSharedInstance().
       LoadDataResourceBytes(IDR_HISTORY_FAVICON,
                             ui::SCALE_FACTOR_100P);
 }