Fix Mojo broker crash on Windows.

mojo/edk/system/child_broker.cc

 // Copyright 2015 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/child_broker.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
@@ skipping 202 matching lines @@
     if (peer_pid == 0) {
       // The other side is in the parent process.
       AttachMessagePipe(pipe, pipe_id, parent_async_channel_);
     } else if (channels_.find(peer_pid) == channels_.end()) {
       // We saw the peer process die before we got the reply from the parent.
       pipe->OnError(ERROR_READ_SHUTDOWN);
     } else {
       CHECK(connected_pipes_.find(pipe) == connected_pipes_.end());
       AttachMessagePipe(pipe, pipe_id, channels_[peer_pid]);
     }
+  } else if (type == PEER_DIED) {
+    DCHECK(!platform_handles);
+    const PeerDiedMessage* message =
+        static_cast<const PeerDiedMessage*>(message_view.bytes());
+
+    uint64_t pipe_id = message->pipe_id;
+
+    CHECK(pending_connects_.find(pipe_id) != pending_connects_.end());
+    MessagePipeDispatcher* pipe = pending_connects_[pipe_id];
+    pending_connects_.erase(pipe_id);
+    pipe->OnError(ERROR_READ_SHUTDOWN);
   } else {
     NOTREACHED();
   }
 }
 
 void ChildBroker::OnError(Error error) {
   // The parent process shut down.
 }
 
 void ChildBroker::ChannelDestructed(RoutedRawChannel* channel) {
@@ skipping 95 matching lines @@
   if (WriteAndReadResponse(&message, handles, response_size)) {
     server->reset(PlatformHandle(handles[0]));
     client->reset(PlatformHandle(handles[1]));
   }
 }
 
 #endif
 
 }  // namespace edk
 }  // namespace mojo