base: Remove an unused member from MessagePumpLibevent::FileDescriptorWatcher

base/message_pump_libevent.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 BASE_MESSAGE_PUMP_LIBEVENT_H_
 #define BASE_MESSAGE_PUMP_LIBEVENT_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 53 matching lines @@
     // Stop watching the FD, always safe to call.  No-op if there's nothing
     // to do.
     bool StopWatchingFileDescriptor();
 
    private:
     friend class MessagePumpLibevent;
     friend class MessagePumpLibeventTest;
 
     // Called by MessagePumpLibevent, ownership of |e| is transferred to this
     // object.
-    void Init(event* e, bool is_persistent);
+    void Init(event* e);
 
     // Used by MessagePumpLibevent to take ownership of event_.
     event *ReleaseEvent();
 
     void set_pump(MessagePumpLibevent* pump) { pump_ = pump; }
     MessagePumpLibevent* pump() { return pump_; }
 
     void set_watcher(Watcher* watcher) { watcher_ = watcher; }
 
     void OnFileCanReadWithoutBlocking(int fd, MessagePumpLibevent* pump);
     void OnFileCanWriteWithoutBlocking(int fd, MessagePumpLibevent* pump);
 
-    bool is_persistent_;  // false if this event is one-shot.
     event* event_;
     MessagePumpLibevent* pump_;
     Watcher* watcher_;
     base::WeakPtrFactory<FileDescriptorWatcher> weak_factory_;
 
     DISALLOW_COPY_AND_ASSIGN(FileDescriptorWatcher);
   };
 
   enum Mode {
     WATCH_READ = 1 << 0,
@@ skipping 74 matching lines @@
   event* wakeup_event_;
 
   ObserverList<IOObserver> io_observers_;
   ThreadChecker watch_file_descriptor_caller_checker_;
   DISALLOW_COPY_AND_ASSIGN(MessagePumpLibevent);
 };
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_PUMP_LIBEVENT_H_