Use POLL* rather than EPOLL* event bits on Fuchsia

runtime/bin/eventhandler_fuchsia.h

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_BIN_EVENTHANDLER_FUCHSIA_H_
 #define RUNTIME_BIN_EVENTHANDLER_FUCHSIA_H_
 
 #if !defined(RUNTIME_BIN_EVENTHANDLER_H_)
 #error Do not include eventhandler_fuchsia.h directly; use eventhandler.h.
 #endif
 
 #include <errno.h>
 #include <magenta/status.h>
 #include <magenta/syscalls.h>
 #include <magenta/syscalls/object.h>
 #include <magenta/syscalls/port.h>
 #include <mxio/private.h>
-#include <sys/epoll.h>
 #include <sys/socket.h>
 #include <unistd.h>
 
 #include "bin/reference_counting.h"
 #include "bin/thread.h"
 #include "platform/signal_blocker.h"
 
 namespace dart {
 namespace bin {
 
@@ skipping 135 matching lines @@
   bool shutdown_;
   mx_handle_t port_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(EventHandlerImplementation);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // RUNTIME_BIN_EVENTHANDLER_FUCHSIA_H_