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

chrome/browser/extensions/extension_management_api.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/extensions/extension_management_api.h"
 
 #include <map>
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 228 matching lines @@
                           OnJSONParseSucceeded)
       IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ParseJSON_Failed,
                           OnJSONParseFailed)
       IPC_MESSAGE_UNHANDLED(handled = false)
     IPC_END_MESSAGE_MAP()
     return handled;
   }
 
   void OnJSONParseSucceeded(const ListValue& wrapper) {
     CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-    Value* value = NULL;
+    const Value* value = NULL;
     CHECK(wrapper.Get(0, &value));
     if (value->IsType(Value::TYPE_DICTIONARY))
-      parsed_manifest_.reset(static_cast<DictionaryValue*>(value)->DeepCopy());
+      parsed_manifest_.reset(
+          static_cast<const DictionaryValue*>(value)->DeepCopy());
     else
       error_ = keys::kManifestParseError;
 
     BrowserThread::PostTask(
         BrowserThread::UI,
         FROM_HERE,
         base::Bind(&SafeManifestJSONParser::ReportResultFromUIThread, this));
   }
 
   void OnJSONParseFailed(const std::string& error) {
@@ skipping 322 matching lines @@
     ExtensionService* service = profile->GetExtensionService();
     args.Append(CreateExtensionInfo(*extension, service));
   }
 
   std::string args_json;
   base::JSONWriter::Write(&args, &args_json);
 
   profile->GetExtensionEventRouter()->DispatchEventToRenderers(
       event_name, args_json, NULL, GURL(), extensions::EventFilteringInfo());
 }