Make the gyp files more cross-platform across the Unices

chrome/chrome_renderer.gypi

 # Copyright (c) 2011 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': 'renderer',
       'type': '<(library)',
       'msvs_guid': '9301A569-5D2B-4D11-9332-B1E30AEACB8D',
@@ skipping 169 matching lines @@
           ],
           'sources': [
             'renderer/nacl_desc_wrapper_chrome.cc',
           ],
         }],
         ['OS=="mac"', {
           'dependencies': [
             '../third_party/mach_override/mach_override.gyp:mach_override',
           ],
         }],
-        ['OS=="linux"', {
+        ['toolkit_uses_gtk == 1', {
           'conditions': [
             [ 'linux_use_tcmalloc==1', {
                 'dependencies': [
                   '../base/allocator/allocator.gyp:allocator',
                 ],
               },
             ],
           ],
           'dependencies': [
             '../build/linux/system.gyp:gtk',
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
-        ['OS=="openbsd" or OS=="freebsd"', {
-          'dependencies': [
-            '../build/linux/system.gyp:gtk',
-          ],
-        }],
         ['OS=="win"', {
           'include_dirs': [
             '<(DEPTH)/third_party/wtl/include',
           ],
           'conditions': [
             ['win_use_allocator_shim==1', {
               'dependencies': [
                 '<(allocator_target)',
               ],
               'export_dependent_settings': [
@@ skipping 49 matching lines @@
       ],
     },
   ],
 }
 
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