Remove support for building frog at the top-level: it requires node.

dart/dart.gyp

 # Copyright (c) 2011, 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': 'compiler',
       'type': 'none',
       'dependencies': [
         'compiler/dart-compiler.gyp:dartc',
       ],
       'actions': []
     },
     {
       'target_name': 'runtime',
       'type': 'none',
       'dependencies': [
         'runtime/dart-runtime.gyp:dart',
         'runtime/dart-runtime.gyp:dart_bin',
         'runtime/dart-runtime.gyp:run_vm_tests',
         'runtime/dart-runtime.gyp:process_test',
       ],
     },
-    {
-      'target_name': 'frog',
-      'type': 'none',
-      'dependencies': [
-        'frog/dart-frog.gyp:frog',
-      ],
-    },
-    {
-      'target_name': 'frogsh',
-      'type': 'none',
-      'dependencies': [
-        'frog/dart-frog.gyp:frogsh',
-      ],
-    },
+    # TODO(ngeoffray): Requires node to be in the path.
+    #{
+    #  'target_name': 'frog',
+    #  'type': 'none',
+    #  'dependencies': [
+    #    'frog/dart-frog.gyp:frog',
+    #  ],
+    #},
+    #{
+    #  'target_name': 'frogsh',
+    #  'type': 'none',
+    #  'dependencies': [
+    #    'frog/dart-frog.gyp:frogsh',
+    #  ],
+    #},
     # TODO(ngeoffray): Fling does not have proper dependencies,
     # so don't build it for now.
     #{
     #  'target_name': 'client',
     #  'type': 'none',
     #  'dependencies': [
     #    'client/dart.gyp:fling',
     #  ],
     #},
   ],
 }