Remove all uses of toolkit_use_gtk in the gyp files.

net/net.gyp

 # Copyright 2013 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,
 
     'linux_link_kerberos%': 0,
     'use_tracing_cache_backend%': 0,
@@ skipping 282 matching lines @@
               'ocsp/nss_ocsp.h',
               'third_party/mozilla_security_manager/nsKeygenHandler.cpp',
               'third_party/mozilla_security_manager/nsKeygenHandler.h',
               'third_party/mozilla_security_manager/nsNSSCertificateDB.cpp',
               'third_party/mozilla_security_manager/nsNSSCertificateDB.h',
               'third_party/mozilla_security_manager/nsPKCS12Blob.cpp',
               'third_party/mozilla_security_manager/nsPKCS12Blob.h',
             ],
           },
         ],
-        [ 'toolkit_uses_gtk == 1', {
-          'dependencies': [
-            '../build/linux/system.gyp:gdk',
-          ],
-        }],
         [ 'use_nss != 1', {
             'sources!': [
               'cert/cert_verify_proc_nss.cc',
               'cert/cert_verify_proc_nss.h',
               'ssl/client_cert_store_nss.cc',
               'ssl/client_cert_store_nss.h',
               'ssl/client_cert_store_chromeos.cc',
               'ssl/client_cert_store_chromeos.h',
             ],
         }],
@@ skipping 211 matching lines @@
               'dependencies': [
                 '../build/linux/system.gyp:ssl',
               ],
             }, {  # desktop_linux == 0 and chromeos == 0
               'sources!': [
                 'cert/nss_cert_database_unittest.cc',
               ],
             }],
           ],
         }],
-        [ 'toolkit_uses_gtk == 1', {
-            'dependencies': [
-              '../build/linux/system.gyp:gtk',
-            ],
-          },
-        ],
         [ 'os_posix == 1 and OS != "mac" and OS != "android" and OS != "ios"', {
           'conditions': [
             # TODO(dmikurube): Kill linux_use_tcmalloc. http://crbug.com/345554
             ['(use_allocator!="none" and use_allocator!="see_use_tcmalloc") or (use_allocator=="see_use_tcmalloc" and linux_use_tcmalloc==1)', {
               'dependencies': [
                 '../base/allocator/allocator.gyp:allocator',
               ],
             }],
           ],
         }],
@@ skipping 990 matching lines @@
             'net_unittests.isolate',
           ],
           'sources': [
             'net_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }