[android] Switch test scripts to use last modified time instead of md5sum when checking dependencie…

tools/android/android_tools.gyp

 # 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.
 
 {
   'targets': [
     # Intermediate target grouping the android tools needed to run native
     # unittests apks.
     {
       'target_name': 'android_tools',
       'type': 'none',
       'dependencies': [
         'fake_dns/fake_dns.gyp:fake_dns',
         'forwarder2/forwarder.gyp:forwarder2',
         'md5sum/md5sum.gyp:md5sum',
+        'timemodified/timemodified.gyp:timemodified',
         'adb_reboot/adb_reboot.gyp:adb_reboot',
       ],
     },
     {
       'target_name': 'memdump',
       'type': 'none',
       'dependencies': [
         'memdump/memdump.gyp:memdump',
       ],
     }
   ],
 }