ChannelAssociatedGroupController: expect that endpoints may not be in closed state during destructi…

ipc/ipc_mojo_bootstrap.cc

Index: ipc/ipc_mojo_bootstrap.cc
diff --git a/ipc/ipc_mojo_bootstrap.cc b/ipc/ipc_mojo_bootstrap.cc
index 256f394ec0a8281f7d556fe75a936e6a88d8c7f3..7489ded330c6d957c56d713730708de91dc81768 100644
--- a/ipc/ipc_mojo_bootstrap.cc
+++ b/ipc/ipc_mojo_bootstrap.cc
@@ -484,8 +484,17 @@ class ChannelAssociatedGroupController
       Endpoint* endpoint = iter->second.get();
       ++iter;
 
-      DCHECK(endpoint->closed());
-      MarkPeerClosedAndMaybeRemove(endpoint);
+      if (!endpoint->closed()) {
+        // This happens when a NotifyPeerEndpointClosed message been received,
+        // but (1) the interface ID hasn't been used to create local endpoint
+        // handle; and (2) a NotifyEndpointClosedBeforeSent hasn't been
+        // received.
+        DCHECK(!endpoint->client());
+        DCHECK(endpoint->peer_closed());
+        MarkClosedAndMaybeRemove(endpoint);
+      } else {
+        MarkPeerClosedAndMaybeRemove(endpoint);
+      }
     }
 
     DCHECK(endpoints_.empty());