Consolidate 'variations' and 'variations_seed_proto' targets.

components/variations.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'variations',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         '../third_party/mt19937ar/mt19937ar.gyp:mt19937ar',
-        'variations_seed_proto',
       ],
       'sources': [
         'variations/entropy_provider.cc',
         'variations/entropy_provider.h',
+        'variations/proto/variations_seed.proto',
+        'variations/proto/study.proto',
         'variations/metrics_util.cc',
         'variations/metrics_util.h',
         'variations/variations_associated_data.cc',
         'variations/variations_associated_data.h',
         'variations/variations_seed_processor.cc',
         'variations/variations_seed_processor.h',
       ],
-    },
-    {
-      # Protobuf compiler / generator for Chrome Variations seed.
-      'target_name': 'variations_seed_proto',
-      'type': 'static_library',
-      'include_dirs': [
-        '..',
-      ],
-      'sources': [
-        'variations/proto/variations_seed.proto',
-        'variations/proto/study.proto',
-      ],
       'variables': {
         'proto_in_dir': 'variations/proto',
         'proto_out_dir': 'components/variations/proto',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }