Remove defunct chromeos_gtk gyp variable.

build/all.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.
 
 {
   'targets': [
     {
       'target_name': 'All',
       'type': 'none',
       'xcode_create_dependents_test_runner': 1,
@@ skipping 524 matching lines @@
                   'dependencies': [
                     '../pdf/pdf.gyp:pdf',
                   ],
                 }], # internal_pdf
               ]
             },
           ], # targets
         }], # branding=="Chrome"
        ], # conditions
     }], # OS="win"
-    # Old ChromeOS target needed to build pre-Aura targets.
-    ['chromeos_gtk==1', {
-      'targets': [
-        {
-          'target_name': 'chromeos_builder',
-          'type': 'none',
-          'dependencies': [
-            '../base/base.gyp:base_unittests',
-            '../chrome/chrome.gyp:browser_tests',
-            '../chrome/chrome.gyp:chrome',
-            '../chrome/chrome.gyp:interactive_ui_tests',
-            '../chrome/chrome.gyp:performance_browser_tests',
-            '../chrome/chrome.gyp:performance_ui_tests',
-            '../chrome/chrome.gyp:safe_browsing_tests',
-            '../chrome/chrome.gyp:sync_integration_tests',
-            '../chrome/chrome.gyp:sync_unit_tests',
-            '../chrome/chrome.gyp:ui_tests',
-            '../chrome/chrome.gyp:unit_tests',
-            '../content/content.gyp:content_unittests',
-            '../crypto/crypto.gyp:crypto_unittests',
-            '../dbus/dbus.gyp:dbus_unittests',
-            '../ipc/ipc.gyp:ipc_tests',
-            '../jingle/jingle.gyp:jingle_unittests',
-            '../media/media.gyp:ffmpeg_tests',
-            '../media/media.gyp:media_unittests',
-            '../net/net.gyp:net_unittests',
-            '../printing/printing.gyp:printing_unittests',
-            '../remoting/remoting.gyp:remoting_unittests',
-            '../sql/sql.gyp:sql_unittests',
-            '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation_unittests',
-            '../third_party/libphonenumber/libphonenumber.gyp:libphonenumber_unittests',
-            '../ui/ui.gyp:gfx_unittests',
-            '../ui/views/views.gyp:views_unittests',
-            'temp_gyp/googleurl.gyp:googleurl_unittests',
-          ],
-        },
-      ], # targets
-    }], # "chromeos_gtk==1"
     ['use_aura==1', {
       'targets': [
         {
           'target_name': 'aura_builder',
           'type': 'none',
           'dependencies': [
             '../chrome/chrome.gyp:chrome',
             '../chrome/chrome.gyp:unit_tests',
             '../chrome/chrome.gyp:ui_tests',
             '../ui/aura/aura.gyp:*',
@@ skipping 41 matching lines @@
                 '../chrome/chrome.gyp:ui_tests',
                 '../ui/views/views.gyp:views_unittests',
               ],
             }],
           ],
         },
       ],  # targets
     }], # "use_aura==1"
   ], # conditions
 }