Delete Ozone egltest platform.

build/linux/system.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': {
     # If any of the linux_link_FOO below are set to 1, then the corresponding
     # target will be linked against the FOO library (either dynamically or
     # statically, depending on the pkg-config files), as opposed to loading the
     # FOO library dynamically with dlopen.
@@ skipping 175 matching lines @@
                 ],
                 'libraries': [
                   '<!@(<(pkg-config) --libs-only-l gtk+-unix-print-2.0)',
                 ],
               },
             }],
           ],
         },
       ],  # targets
     }],
-    [ 'use_x11==1 or ozone_platform_ozonex==1', {
+    [ 'use_x11==1', {
       # Hide X11 and related dependencies when use_x11=0
       'targets': [
         {
           'target_name': 'x11',
           'type': 'none',
           'toolsets': ['host', 'target'],
           'conditions': [
             ['_toolset=="target"', {
               'direct_dependent_settings': {
                 'cflags': [
@@ skipping 1086 matching lines @@
             ],
             'libraries': [
               '<!@(<(pkg-config) --libs-only-l libffi)',
             ],
           },
         }],
       ],
     },
   ],
 }