Add a guard in MojoBootstrap::OnClientLaunched()

ipc/mojo/ipc_mojo_bootstrap.cc

 // Copyright 2014 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 "ipc/mojo/ipc_mojo_bootstrap.h"
 
 #include "base/logging.h"
 #include "base/process/process_handle.h"
 #include "ipc/ipc_message_utils.h"
 #include "ipc/ipc_platform_file.h"
@@ skipping 66 matching lines @@
   // Is the client launched?
   if (client_process_ == base::kNullProcessHandle)
     return;
   // Has the bootstrap channel been made?
   if (!connected_)
     return;
   SendClientPipe();
 }
 
 void MojoServerBootstrap::OnClientLaunched(base::ProcessHandle process) {
+  if (HasFailed())
+    return;
+
   DCHECK_EQ(state(), STATE_INITIALIZED);
   DCHECK_NE(process, base::kNullProcessHandle);
   client_process_ = process;
   SendClientPipeIfReady();
 }
 
 void MojoServerBootstrap::OnChannelConnected(int32 peer_pid) {
   DCHECK_EQ(state(), STATE_INITIALIZED);
   connected_ = true;
   SendClientPipeIfReady();
@@ skipping 98 matching lines @@
     return;
   DLOG(WARNING) << "Detected error on Mojo bootstrap channel.";
   Fail();
 }
 
 void MojoBootstrap::Fail() {
   set_state(STATE_ERROR);
   delegate()->OnBootstrapError();
 }
 
+bool MojoBootstrap::HasFailed() const {
+  return state() == STATE_ERROR;
+}
+
 bool MojoBootstrap::Send(Message* message) {
   return channel_->Send(message);
 }
 
 #if defined(OS_POSIX) && !defined(OS_NACL)
 int MojoBootstrap::GetClientFileDescriptor() const {
   return channel_->GetClientFileDescriptor();
 }
 
 base::ScopedFD MojoBootstrap::TakeClientFileDescriptor() {
   return channel_->TakeClientFileDescriptor();
 }
 #endif  // defined(OS_POSIX) && !defined(OS_NACL)
 
 }  // namespace IPC