Allow mojo::system::RawChannel::Delegate methods to destroy the RawChannel.

mojo/edk/system/raw_channel_win.cc

 // Copyright 2013 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.
 
 #include "mojo/edk/system/raw_channel.h"
 
 #include <windows.h>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 285 matching lines @@
                                                          DWORD error) {
   DCHECK(!owner_ ||
          base::MessageLoop::current() == owner_->message_loop_for_io());
   DCHECK(suppress_self_destruct_);
 
   CHECK(pending_read_);
   pending_read_ = false;
   if (!owner_)
     return;
 
+  // Note: |OnReadCompleted()| may detach us from |owner_|.
   if (error == ERROR_SUCCESS) {
     DCHECK_GT(bytes_read, 0u);
     owner_->OnReadCompleted(IO_SUCCEEDED, bytes_read);
   } else if (error == ERROR_BROKEN_PIPE) {
     DCHECK_EQ(bytes_read, 0u);
     owner_->OnReadCompleted(IO_FAILED_SHUTDOWN, 0);
   } else {
     DCHECK_EQ(bytes_read, 0u);
     LOG(WARNING) << "ReadFile: " << logging::SystemErrorCodeToString(error);
     owner_->OnReadCompleted(IO_FAILED_UNKNOWN, 0);
@@ skipping 12 matching lines @@
     pending_write_ = false;
     return;
   }
 
   {
     base::AutoLock locker(owner_->write_lock());
     CHECK(pending_write_);
     pending_write_ = false;
   }
 
+  // Note: |OnWriteCompleted()| may detach us from |owner_|.
   if (error == ERROR_SUCCESS) {
     owner_->OnWriteCompleted(IO_SUCCEEDED, 0, bytes_written);
   } else if (error == ERROR_BROKEN_PIPE) {
     owner_->OnWriteCompleted(IO_FAILED_SHUTDOWN, 0, 0);
   } else {
     LOG(WARNING) << "WriteFile: " << logging::SystemErrorCodeToString(error);
     owner_->OnWriteCompleted(IO_FAILED_UNKNOWN, 0, 0);
   }
 }
 
@@ skipping 219 matching lines @@
 
 // Static factory method declared in raw_channel.h.
 // static
 scoped_ptr<RawChannel> RawChannel::Create(
     embedder::ScopedPlatformHandle handle) {
   return make_scoped_ptr(new RawChannelWin(handle.Pass()));
 }
 
 }  // namespace system
 }  // namespace mojo