Enable FilePathWatcher base unittests on Android.

base/base.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 810 matching lines @@
             ['include', '^mac/bind_objc_block_unittest\\.mm$'],
             ['include', '^mac/foundation_util_unittest\\.mm$',],
             ['include', '^mac/objc_property_releaser_unittest\\.mm$'],
             ['include', '^mac/scoped_nsobject_unittest\\.mm$'],
             ['include', '^sys_string_conversions_mac_unittest\\.mm$'],
           ],
         }],
         ['OS == "android"', {
           'sources/': [
             ['include', '^debug/proc_maps_linux_unittest\\.cc$'],
-            ['exclude', '^files/file_path_watcher_unittest\\.cc$'],
           ],
         }],
         # Enable more direct string conversions on platforms with native utf8
         # strings
         ['OS=="mac" or OS=="ios" or <(chromeos)==1 or <(chromecast)==1', {
           'defines': ['SYSTEM_NATIVE_UTF8'],
         }],
       ],  # target_conditions
     },
     {
@@ skipping 759 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }