Include Event.h in fewer header files

Source/modules/filesystem/InspectorFileSystemAgent.cpp

 /*
  * Copyright (C) 2011, 2012 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 "modules/filesystem/InspectorFileSystemAgent.h"
 
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/DOMImplementation.h"
 #include "core/dom/Document.h"
+#include "core/events/Event.h"
 #include "core/fileapi/File.h"
 #include "core/fileapi/FileError.h"
 #include "core/fileapi/FileReader.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/VoidCallback.h"
 #include "core/html/parser/TextResourceDecoder.h"
 #include "core/inspector/InspectorState.h"
 #include "core/page/Page.h"
 #include "modules/filesystem/DOMFileSystem.h"
 #include "modules/filesystem/DirectoryEntry.h"
@@ skipping 674 matching lines @@
         LocalFrame* localFrame = toLocalFrame(frame);
         if (localFrame->document() && localFrame->document()->securityOrigin()->isSameSchemeHostPort(origin))
             return localFrame->document();
     }
 
     *error = "No frame is available for the request";
     return 0;
 }
 
 } // namespace WebCore