Remove all exclude rules that filename_rules.gypi already handles.

ash/ash.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,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
   'includes': [
@@ skipping 624 matching lines @@
           ],
         }],
         ['chromeos==1', {
           'dependencies': [
             '../chromeos/chromeos.gyp:chromeos',
             # Ash #includes power_supply_properties.pb.h directly.
             '../chromeos/chromeos.gyp:power_manager_proto',
           ],
         }, { # else: chromeos!=1
           'sources/': [
-            ['exclude', '/chromeos/'],
             ['exclude', 'display/output_configurator_animation.cc'],
             ['exclude', 'display/output_configurator_animation.h'],
           ],
         }],
       ],
     },
 
     {
       'target_name': 'ash_with_content',
       'type': '<(component)',
@@ skipping 410 matching lines @@
             },
           },
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
       ],
     },
   ],
 }