Include Event.h in fewer header files

Source/core/inspector/AsyncCallStackTracker.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/inspector/AsyncCallStackTracker.h"
 
 #include "bindings/v8/V8RecursionScope.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/ExecutionContext.h"
+#include "core/events/Event.h"
 #include "core/events/EventTarget.h"
 #include "core/xml/XMLHttpRequest.h"
 #include "core/xml/XMLHttpRequestUpload.h"
 #include "wtf/text/AtomicStringHash.h"
 #include "wtf/text/StringBuilder.h"
 #include <v8.h>
 
 namespace {
 
 static const char setTimeoutName[] = "setTimeout";
@@ skipping 304 matching lines @@
 {
     m_currentAsyncCallChain.clear();
     m_nestedAsyncCallCount = 0;
     ExecutionContextDataMap copy;
     m_executionContextDataMap.swap(copy);
     for (ExecutionContextDataMap::const_iterator it = copy.begin(); it != copy.end(); ++it)
         delete it->value;
 }
 
 } // namespace WebCore