Add a guard in MojoBootstrap::OnClientLaunched()

ipc/mojo/ipc_mojo_bootstrap.cc

Index: ipc/mojo/ipc_mojo_bootstrap.cc
diff --git a/ipc/mojo/ipc_mojo_bootstrap.cc b/ipc/mojo/ipc_mojo_bootstrap.cc
index 7233de0fa2d0259b5389f5e1306397b81f9683fa..30c33a89f7c0f4409b4181e718b496f78b0f0d8d 100644
--- a/ipc/mojo/ipc_mojo_bootstrap.cc
+++ b/ipc/mojo/ipc_mojo_bootstrap.cc
@@ -84,6 +84,9 @@ void MojoServerBootstrap::SendClientPipeIfReady() {
 }
 
 void MojoServerBootstrap::OnClientLaunched(base::ProcessHandle process) {
+  if (HasFailed())
+    return;
+
   DCHECK_EQ(state(), STATE_INITIALIZED);
   DCHECK_NE(process, base::kNullProcessHandle);
   client_process_ = process;
@@ -202,6 +205,10 @@ void MojoBootstrap::Fail() {
   delegate()->OnBootstrapError();
 }
 
+bool MojoBootstrap::HasFailed() const {
+  return state() == STATE_ERROR;
+}
+
 bool MojoBootstrap::Send(Message* message) {
   return channel_->Send(message);
 }