Revert "Hide collection-dev library."

runtime/vm/vm.gypi

 # 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': {
     'builtin_in_cc_file': '../bin/builtin_in.cc',
     'async_cc_file': '<(SHARED_INTERMEDIATE_DIR)/async_gen.cc',
     'async_patch_cc_file': '<(SHARED_INTERMEDIATE_DIR)/async_patch_gen.cc',
     'corelib_cc_file': '<(SHARED_INTERMEDIATE_DIR)/corelib_gen.cc',
@@ skipping 345 matching lines @@
       ]
     },
     {
       'target_name': 'generate_collection_dev_cc_file',
       'type': 'none',
       'variables': {
         'collection_dev_dart': '<(SHARED_INTERMEDIATE_DIR)/collection_dev_gen.dart',
       },
       'includes': [
         # Load the shared collection_dev library sources.
-        '../../sdk/lib/_collection_dev/collection_dev_sources.gypi',
+        '../../sdk/lib/collection_dev/collection_dev_sources.gypi',
       ],
       'sources/': [
         # Exclude all .[cc|h] files.
         # This is only here for reference. Excludes happen after
         # variable expansion, so the script has to do its own
         # exclude processing of the sources being passed.
         ['exclude', '\\.cc|h$'],
       ],
       'actions': [
         {
@@ skipping 475 matching lines @@
             '--include', 'INTENTIONALLY_LEFT_BLANK',
             '--var_name', 'INTENTIONALLY_LEFT_BLANK_TOO',
             '<(snapshot_test_dart_file)',
           ],
           'message': 'Generating ''<(snapshot_test_dat_file)'' file.'
         },
       ]
     },
   ]
 }