Regularize some naming to make BUILD.gn files easier to write.

utils/apidoc/docgen.gyp

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables' : {
     'script_suffix%': '',
   },
   'conditions' : [
     ['OS=="win"', {
       'variables' : {
         'script_suffix': '.bat',
       },
     }],
   ],
   'targets': [
     {
       'target_name': 'docgen',
       'type': 'none',
       'dependencies': [
         '../../create_sdk.gyp:create_sdk_internal',
         '../../pkg/pkg.gyp:pkg_packages',
         '../../pkg/pkg_files.gyp:pkg_files_stamp',
       ],
       'includes': [
-        '../../sdk/lib/core/corelib_sources.gypi',
+        '../../sdk/lib/core/core_sources.gypi',
       ],
       'actions': [
         {
           'action_name': 'run_docgen',
           # The 'inputs' list records the files whose timestamps are
           # compared to the files listed in 'outputs'.  If a file
           # 'outputs' doesn't exist or if a file in 'inputs' is newer
           # than a file in 'outputs', this action is executed.  Notice
           # that the dependencies listed above has nothing to do with
           # when this action is executed.  You must list a file in
@@ skipping 52 matching lines @@
             '--exclude-lib=expect',
             '--exclude-lib=try',
             '../../pkg'
           ],
           'message': 'Running docgen: <(_action)',
         },
       ],
     }
   ],
 }