Rewrite simple uses of base::ListValue::Append(base::Value*) on CrOS.

chrome/browser/chromeos/file_manager/file_browser_handlers.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/chromeos/file_manager/file_browser_handlers.h"
 
 #include <stddef.h>
 #include <algorithm>
 #include <set>
 #include <utility>
@@ skipping 369 matching lines @@
   extensions::EventRouter* router = extensions::EventRouter::Get(profile_);
   if (!router) {
     ExecuteDoneOnUIThread(false);
     return;
   }
 
   SetupHandlerHostFileAccessPermissions(
       file_definition_list.get(), extension_.get(), handler_pid);
 
   std::unique_ptr<base::ListValue> event_args(new base::ListValue());
-  event_args->Append(new base::StringValue(action_id_));
+  event_args->AppendString(action_id_);
   base::DictionaryValue* details = new base::DictionaryValue();
   event_args->Append(details);
   // Get file definitions. These will be replaced with Entry instances by
   // dispatchEvent() method from event_binding.js.
   base::ListValue* file_entries = new base::ListValue();
   details->Set("entries", file_entries);
 
   for (EntryDefinitionList::const_iterator iter =
            entry_definition_list->begin();
        iter != entry_definition_list->end();
@@ skipping 127 matching lines @@
       if (common_handlers.empty())
         return FileBrowserHandlerList();
     }
   }
 
   return common_handlers;
 }
 
 }  // namespace file_browser_handlers
 }  // namespace file_manager