Delete ChromeOS code

gyp/core.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # Core Skia library code.
 {
   'targets': [
     {
       'target_name': 'core',
       'product_name': 'skia_core',
@@ skipping 18 matching lines @@
         '../src/sfnt',
         '../src/image',
         '../src/opts',
         '../src/utils',
       ],
       'sources': [
         'core.gypi', # Makes the gypi appear in IDEs (but does not modify the build).
       ],
       'msvs_disabled_warnings': [4244, 4267,4345, 4390, 4554, 4800],
       'conditions': [
-        [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "chromeos"]', {
+        [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris"]', {
           'link_settings': {
             'libraries': [
               '-lpthread',
             ],
           },
         }],
         [ 'skia_os == "mac"', {
           'include_dirs': [
             '../include/utils/mac',
           ],
@@ skipping 65 matching lines @@
           [ 'skia_os == "win"', {
             'include_dirs': [
               'config/win',
             ],
           }],
         ],
       },
     },
   ],
 }