IPC: Relax thread constraints on Channel-associated send

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 5a60ead81ad30b348cc3958b09e204bb60e23146..8f27cbd477bc5c14980de00f649fed3910304233 100644
--- a/ipc/ipc_mojo_bootstrap.cc
+++ b/ipc/ipc_mojo_bootstrap.cc
@@ -484,9 +484,8 @@ class ChannelAssociatedGroupController
       }
       return connector_->Accept(message);
     } else {
-      // We always post tasks to the master endpoint thread when called from the
-      // proxy thread in order to simulate IPC::ChannelProxy::Send behavior.
-      DCHECK(proxy_task_runner_->BelongsToCurrentThread());
+      // We always post tasks to the master endpoint thread when called from
+      // other threads in order to simulate IPC::ChannelProxy::Send behavior.
       task_runner_->PostTask(
           FROM_HERE,
           base::Bind(