Don't depend on libdart_io in run_vm_tests and gen_snapshot.

runtime/bin/bin.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': {
     'gen_source_dir': '<(SHARED_INTERMEDIATE_DIR)',
 
     'io_cc_file': '<(gen_source_dir)/io_gen.cc',
     'io_patch_cc_file': '<(gen_source_dir)/io_patch_gen.cc',
@@ skipping 152 matching lines @@
             'libraries': [
               '-ldl',
             ],
           },
         }],
       ],
     },
     {
       'target_name': 'libdart_io',
       'type': 'static_library',
-      'toolsets':['target', 'host'],
       'include_dirs': [
         '..',
       ],
       'includes': [
         'io_impl_sources.gypi',
       ],
       'sources': [
         'io_natives.h',
         'io_natives.cc',
       ],
@@ skipping 65 matching lines @@
       ],
     },
     {
       # Completely statically linked binary for generating snapshots.
       'target_name': 'gen_snapshot',
       'type': 'executable',
       'toolsets':['host'],
       'dependencies': [
         'libdart_withcore',
         'libdart_builtin',
-        'libdart_io',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'gen_snapshot.cc',
         # Very limited native resolver provided.
         'builtin_gen_snapshot.cc',
         'builtin.cc',
         'builtin.h',
@@ skipping 215 matching lines @@
     {
       'target_name': 'process_test',
       'type': 'executable',
       'sources': [
         'process_test.cc',
       ]
     },
     {
       'target_name': 'run_vm_tests',
       'type': 'executable',
-      'toolsets':['target'],
       'dependencies': [
         'libdart_withcore',
         'libdart_builtin',
         'libdart_io',
         'generate_snapshot_file#host',
         'generate_snapshot_test_dat_file#host',
       ],
       'include_dirs': [
         '..',
         '<(gen_source_dir)',
@@ skipping 35 matching lines @@
         }],
       ],
     },
     {
       'target_name': 'run_vm_tests.host',
       'type': 'executable',
       'toolsets':['host'],
       'dependencies': [
         'libdart_withcore',
         'libdart_builtin',
-        'libdart_io',
         'generate_snapshot_file#host',
         'generate_snapshot_test_dat_file#host',
       ],
       'include_dirs': [
         '..',
         '<(gen_source_dir)',
       ],
       'sources': [
         'run_vm_tests.cc',
         'builtin_natives.cc',
@@ skipping 71 matching lines @@
         }],
         ['OS=="linux"', {
           'cflags': [
             '-fPIC',
           ],
         }],
       ],
     },
   ],
 }