Remove handler from MessagePumpForIO::IOContext.

ipc/ipc_channel_win.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 IPC_IPC_CHANNEL_WIN_H_
 #define IPC_IPC_CHANNEL_WIN_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 64 matching lines @@
   // ProcessMessageForDelivery().
   void FlushPrelimQueue();
 
   // MessageLoop::IOHandler implementation.
   void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
                      DWORD bytes_transfered,
                      DWORD error) override;
 
  private:
   struct State {
-    explicit State(ChannelWin* channel);
+    State();
     ~State();
     base::MessageLoopForIO::IOContext context;
-    bool is_pending;
+    bool is_pending = false;
   };
 
   State input_state_;
   State output_state_;
 
   base::win::ScopedHandle pipe_;
 
   base::ProcessId peer_pid_;
 
   // Messages not yet ready to be sent are queued here. Messages removed from
@@ skipping 33 matching lines @@
 
   std::unique_ptr<base::ThreadChecker> thread_check_;
 
   base::WeakPtrFactory<ChannelWin> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(ChannelWin);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_WIN_H_