Remove all blimp engine code

blimp/engine/start_engine.sh

-#!/bin/bash
-
-# Copyright 2016 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.
-
-# Launch stunnel once and only once. This should never crash, but if it does,
-# everything should die.
-stunnel \
-  -p /engine/data/stunnel.pem \
-  -P /engine/stunnel.pid \
-  -d 25466 -r 25467 -f &
-
-# Start (and restart) the engine so long as there hasn't been an error.
-# Currently, the engine can cleanly exit in the event that a connection is lost.
-# In these cases, it's safe to restart the engine. However, if either stunnel or
-# the engine exit with a nonzero return code, stop all execution.
-while :; do
-  LD_LIBRARY_PATH=/engine/ /engine/blimp_engine_app \
-    --android-fonts-path=/engine/fonts/font_bundle/marshmallow \
-    --blimp-client-token-path=/engine/data/client_token \
-    --vmodule="remote_channel_main=1,blimp*=1" \
-    $@ &
-
-  # Wait for a process to exit. Bomb out if anything had an error.
-  wait -n  # Returns the exited process's return code.
-  retcode=$?
-  if [ $retcode -ne 0 ]; then
-    exit $retcode
-  fi
-done