Remove all uses of toolkit_use_gtk in the gyp files.

build/filename_rules.gypi

 # 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.
 
 # This gypi file defines the patterns used for determining whether a
 # file is excluded from the build on a given platform.  It is
 # included by common.gypi for chromium_code.
 
 {
   'target_conditions': [
@@ skipping 53 matching lines @@
       ],
     }],
     ['<(use_x11)!=1 or >(nacl_untrusted_build)==1', {
       'sources/': [
         ['exclude', '_(x|x11)(_unittest)?\\.(h|cc)$'],
         ['exclude', '(^|/)x11_[^/]*\\.(h|cc)$'],
         ['exclude', '(^|/)x11/'],
         ['exclude', '(^|/)x/'],
       ],
     }],
-    ['<(toolkit_uses_gtk)!=1 or >(nacl_untrusted_build)==1', {
-      'sources/': [
-        ['exclude', '_gtk(_browsertest|_unittest)?\\.(h|cc)$'],
-        ['exclude', '(^|/)gtk/'],
-        ['exclude', '(^|/)gtk_[^/]*\\.(h|cc)$'],
-      ],
-    }],
     ['<(toolkit_views)==0 or >(nacl_untrusted_build)==1', {
       'sources/': [ ['exclude', '_views\\.(h|cc)$'] ]
     }],
     ['<(use_aura)==0 or >(nacl_untrusted_build)==1', {
       'sources/': [ ['exclude', '_aura(_browsertest|_unittest)?\\.(h|cc)$'],
                     ['exclude', '(^|/)aura/'],
       ]
     }],
     ['<(use_aura)==0 or <(use_x11)==0 or >(nacl_untrusted_build)==1', {
       'sources/': [ ['exclude', '_aurax11(_browsertest|_unittest)?\\.(h|cc)$'] ]
@@ skipping 25 matching lines @@
     ['<(ozone_platform_dri)==0 or >(nacl_untrusted_build)==1', {
       'sources/': [ ['exclude', '_dri(_browsertest|_unittest)?\\.(h|cc)$'],
                     ['exclude', '(^|/)dri/'],
       ]
     }],
     ['<(use_pango)==0', {
       'sources/': [ ['exclude', '(^|_)pango(_util|_browsertest|_unittest)?\\.(h|cc)$'], ],
     }],
   ]
 }