Remove package root target and support scripts

tools/bots/run_android_tests.sh

 #!/usr/bin/env bash
 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This script is meant to be run inside the src directory of a Dartium
 # (or Chromium) checkout, with android_tools installed in third_party.
 # It expects ContentShell to have been built for ARM android, using the
 # ninja build system.
 # It expects one or more android devices to be connected by USB to the machine.
 set -v
 set -x
 cd src
 ninja -C out/Release forwarder2
-ninja -C out/Release pkg_packages
-cp -R out/Release/packages out/ReleaseARM
 export PATH=$PATH:third_party/android_tools/sdk/platform-tools/\
 :third_party/android_tools/sdk/tools/
 
 ./build/android/adb_reverse_forwarder.py --all-devices \
     8081 8081 8082 8082 8083 8083 8084 8084 &
 FORWARDER_PID=$!
 sleep 15
 ./dart/tools/test.py -m release -a arm --progress=line --report --time \
     --failure-summary --write-debug-log --local_ip=localhost \
     --test_server_port=8083 --test_server_cross_origin_port=8084 \
     --test_driver_port=8081 --test_driver_error_port=8082 \
     -r ContentShellOnAndroid --drt=$1
 EXIT_CODE=$?
 kill -9 $FORWARDER_PID
 exit $EXIT_CODE