fix gyp build after CL2147613002

components/tracing.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This file is intentionally a gyp file rather than a gypi for dependencies
 # reasons. The other gypi files include content.gyp and content_common depends
 # on this, thus if you try to rename this to gypi and include it in
 # components.gyp, you will get a circular dependency error.
 {
@@ skipping 71 matching lines @@
         'proto_out_dir': 'components/tracing/test',
         'generator_plugin': 'proto_zero_plugin',
         'generator_plugin_suffix': '.pbzero',
         'generate_cc': 0,
         'generate_python': 0,
       },
       'sources': [
         'tracing/test/example_messages.proto',
       ],
       'dependencies': [
-        'proto_zero_plugin',
+        'proto_zero_plugin#host',
       ],
       'includes': ['../build/protoc.gypi'],
     },
   ],
 }