Remove all exclude rules that filename_rules.gypi already handles.

printing/printing.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,
   },
   'targets': [
     {
@@ skipping 86 matching lines @@
         ],
       },
       'conditions': [
         ['use_aura==1', {
           'dependencies': [
             '<(DEPTH)/ui/aura/aura.gyp:aura',
           ],
         }], 
         ['toolkit_uses_gtk == 0',{
             'sources/': [['exclude', '_cairo\\.cc$']]
-        }],
-        ['OS!="mac"', {'sources/': [['exclude', '_mac\\.(cc|mm?)$']]}],
-        ['OS!="win"', {'sources/': [['exclude', '_win\\.cc$']]
-          }, {  # else: OS=="win"
-            'sources/': [['exclude', '_posix\\.cc$']]
-        }],
-        ['toolkit_uses_gtk == 1', {
+          }, {  # else: toolkit_uses_gtk == 1
           'dependencies': [
             # For FT_Init_FreeType and friends.
             '../build/linux/system.gyp:freetype2',
             '../build/linux/system.gyp:gtk',
             '../build/linux/system.gyp:gtkprint',
           ],
         }],
         # Mac-Aura does not support printing.
         ['OS=="mac" and use_aura==1',{
           'sources!': [
@@ skipping 226 matching lines @@
           },
           'dependencies': [
             '../base/base.gyp:base_java',
           ],
           'includes': [ '../build/java.gypi'  ],
         }
       ]
     }],
   ]
 }