Remove IOObservers from MessageLoopForIO.

base/message_loop/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_LOOP_MESSAGE_PUMP_LIBEVENT_H_
 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_LIBEVENT_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/message_loop/message_pump.h"
-#include "base/observer_list.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/time.h"
 
 // Declare structs we need from libevent.h rather than including it
 struct event_base;
 struct event;
 
 namespace base {
 
 // Class to monitor sockets and issue callbacks when sockets are ready for I/O
 // TODO(dkegel): add support for background file IO somehow
 class BASE_EXPORT MessagePumpLibevent : public MessagePump {
  public:
-  class IOObserver {
-   public:
-    IOObserver() {}
-
-    // An IOObserver is an object that receives IO notifications from the
-    // MessagePump.
-    //
-    // NOTE: An IOObserver implementation should be extremely fast!
-    virtual void WillProcessIOEvent() = 0;
-    virtual void DidProcessIOEvent() = 0;
-
-   protected:
-    virtual ~IOObserver() {}
-  };
-
   // Used with WatchFileDescriptor to asynchronously monitor the I/O readiness
   // of a file descriptor.
   class Watcher {
    public:
     // Called from MessageLoop::Run when an FD can be read from/written to
     // without blocking
     virtual void OnFileCanReadWithoutBlocking(int fd) = 0;
     virtual void OnFileCanWriteWithoutBlocking(int fd) = 0;
 
    protected:
@@ skipping 62 matching lines @@
   // event previously attached to |controller| is aborted.
   // Returns true on success.
   // Must be called on the same thread the message_pump is running on.
   // TODO(dkegel): switch to edge-triggered readiness notification
   bool WatchFileDescriptor(int fd,
                            bool persistent,
                            int mode,
                            FileDescriptorWatcher *controller,
                            Watcher *delegate);
 
-  void AddIOObserver(IOObserver* obs);
-  void RemoveIOObserver(IOObserver* obs);
-
   // MessagePump methods:
   void Run(Delegate* delegate) override;
   void Quit() override;
   void ScheduleWork() override;
   void ScheduleDelayedWork(const TimeTicks& delayed_work_time) override;
 
  private:
   friend class MessagePumpLibeventTest;
 
   void WillProcessIOEvent();
@@ skipping 26 matching lines @@
   // readiness callbacks when a socket is ready for I/O.
   event_base* event_base_;
 
   // ... write end; ScheduleWork() writes a single byte to it
   int wakeup_pipe_in_;
   // ... read end; OnWakeup reads it and then breaks Run() out of its sleep
   int wakeup_pipe_out_;
   // ... libevent wrapper for read end
   event* wakeup_event_;
 
-  ObserverList<IOObserver> io_observers_;
   ThreadChecker watch_file_descriptor_caller_checker_;
   DISALLOW_COPY_AND_ASSIGN(MessagePumpLibevent);
 };
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_LIBEVENT_H_