Delete ChromeOS code

gyp/debugger.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.
 {
   'variables': {
     'skia_warnings_as_errors': 0,
     'conditions': [
-      [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "chromeos"]', {
+      [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris"]', {
         # Use the systemwide Qt libs by default
         'variables': {
           'qt_sdk%': '/usr',
         },
         'qt_sdk': '<(qt_sdk)',
         'qt_moc%': 'moc',
         'qt_includes': [
           '<(qt_sdk)/include',
           '<(qt_sdk)/include/QtCore',
           '<(qt_sdk)/include/QtGui',
@@ skipping 149 matching lines @@
           'outputs': [ '<(moc_gen_dir)/moc_<(RULE_INPUT_ROOT).cpp' ],
           'action': [ '<(qt_moc)', '-DSK_SUPPORT_GPU=<(skia_gpu)',
                       '<(RULE_INPUT_PATH)',
                       '-o', '<(moc_gen_dir)/moc_<(RULE_INPUT_ROOT).cpp' ],
           'message': 'Generating <(RULE_INPUT_ROOT).cpp.',
         },
       ],
     },
   ],
 }