Cleanup coding style

extensions/common/event_filter.h

 // 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.
 
 #ifndef EXTENSIONS_COMMON_EVENT_FILTER_H_
 #define EXTENSIONS_COMMON_EVENT_FILTER_H_
 
 #include <map>
 #include <set>
+#include <string>
+#include <vector>
 
 #include "base/memory/linked_ptr.h"
 #include "components/url_matcher/url_matcher.h"
 #include "extensions/common/event_filtering_info.h"
 #include "extensions/common/event_matcher.h"
 
 namespace extensions {
 
 // Matches incoming events against a collection of EventMatchers. Each added
 // EventMatcher is given an id which is returned by MatchEvent() when it is
@@ skipping 100 matching lines @@
 
   // Maps from event matcher ids to the name of the event they match on.
   std::map<MatcherID, std::string> id_to_event_name_;
 
   DISALLOW_COPY_AND_ASSIGN(EventFilter);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_EVENT_FILTER_H_