Remove raw base::DictionaryValue::Set in //extensions

extensions/browser/event_listener_map_unittest.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 "extensions/browser/event_listener_map.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
+#include "base/values.h"
 #include "content/public/test/mock_render_process_host.h"
 #include "content/public/test/test_browser_context.h"
 #include "extensions/browser/event_router.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
 using base::DictionaryValue;
 using base::ListValue;
 using base::Value;
 
@@ skipping 353 matching lines @@
 
   std::unique_ptr<Event> event(
       CreateEvent(kEvent1Name, GURL("http://www.google.com")));
   std::set<const EventListener*> targets(listeners_->GetEventListeners(*event));
   ASSERT_EQ(0u, targets.size());
 }
 
 }  // namespace
 
 }  // namespace extensions