Step 1 in removing the old dartdoc code from repo.

dart.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.
 
 {
   'targets': [
     {
       'target_name': 'most',
       'type': 'none',
       'dependencies': [
@@ skipping 102 matching lines @@
       'type': 'none',
       'dependencies': [
         'create_sdk',
         'packages',
       ],
     },
     {
       'target_name': 'api_docs',
       'type': 'none',
       'dependencies': [
-        # TODO(alanknight) : Once we're fully switched over to the new
-        # viewer remove the old api_docs gyp file.
-        'utils/apidoc/apidoc.gyp:api_docs',
         'utils/apidoc/docgen.gyp:docgen',
       ],
     },
     {
       'target_name': 'editor',
       'type': 'none',
       'dependencies': [
         'editor/build/generated/editor_deps.gyp:editor_deps',
 
         # This dependency on create_sdk does not mean that the Editor
@@ skipping 51 matching lines @@
     {
       'target_name': 'try',
       'type': 'none',
       'dependencies': [
         'create_sdk',
         'site/try/build_try.gyp:try_site',
       ],
     },
   ],
 }