Update emulator to work with version 18 of Android API.

build/android/install_emulator_deps.py

 #!/usr/bin/env python
 # Copyright (c) 2013 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.
 
 """Installs deps for using SDK emulator for testing.
 
 The script will download system images, if they are not present, and
 install and enable KVM, if virtualization has been enabled in the BIOS.
 """
 
 
 import logging
 import os
 import shutil
 import sys
 
 from pylib import cmd_helper
 from pylib import constants
 from pylib.utils import run_tests_helper
 
 # Android x86 system image from the Intel website:
 # http://software.intel.com/en-us/articles/intel-eula-x86-android-4-2-jelly-bean-bin
-X86_IMG_URL = 'http://download-software.intel.com/sites/landingpage/android/sysimg_x86-17_r01.zip'
+X86_IMG_URL = 'http://download-software.intel.com/sites/landingpage/android/sysimg_x86-18_r01.zip'
 
 # Android API level
 API_TARGET = 'android-%s' % constants.ANDROID_SDK_VERSION
 
 
 def CheckSDK():
   """Check if SDK is already installed.
 
   Returns:
     True if android_tools directory exists in current directory.
@@ skipping 85 matching lines @@
 
   # Make sure KVM packages are installed and enabled.
   if CheckKVM():
     logging.info('KVM already installed and enabled.')
   else:
     InstallKVM()
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))