Update from https://crrev.com/304418

sandbox/linux/syscall_broker/broker_process.cc

 // Copyright (c) 2012 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 "sandbox/linux/syscall_broker/broker_process.h"
 
 #include <fcntl.h>
 #include <signal.h>
 #include <sys/stat.h>
 #include <sys/syscall.h>
@@ skipping 80 matching lines @@
         case BrokerHost::RequestStatus::LOST_CLIENT:
           _exit(1);
         case BrokerHost::RequestStatus::SUCCESS:
         case BrokerHost::RequestStatus::FAILURE:
           continue;
       }
     }
     _exit(1);
   }
   NOTREACHED();
+  return false;
 }
 
 void BrokerProcess::CloseChannel() {
   broker_client_.reset();
 }
 
 int BrokerProcess::Access(const char* pathname, int mode) const {
   RAW_CHECK(initialized_);
   return broker_client_->Access(pathname, mode);
 }
 
 int BrokerProcess::Open(const char* pathname, int flags) const {
   RAW_CHECK(initialized_);
   return broker_client_->Open(pathname, flags);
 }
 
 }  // namespace syscall_broker
 
 }  // namespace sandbox.