[Variations] Bring variations_http_header_provider to variations component

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': [
     {
       # GN version: //components/variations
       'target_name': 'variations',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         '../third_party/mt19937ar/mt19937ar.gyp:mt19937ar',
+        'components.gyp:google_core_browser',
       ],
       'sources': [
         'variations/active_field_trials.cc',
         'variations/active_field_trials.h',
         'variations/android/component_jni_registrar.cc',
         'variations/android/component_jni_registrar.h',
         'variations/android/variations_associated_data_android.cc',
         'variations/android/variations_associated_data_android.h',
         'variations/caching_permuted_entropy_provider.cc',
         'variations/caching_permuted_entropy_provider.h',
         'variations/entropy_provider.cc',
         'variations/entropy_provider.h',
         'variations/metrics_util.cc',
         'variations/metrics_util.h',
         'variations/pref_names.cc',
         'variations/pref_names.h',
         'variations/processed_study.cc',
         'variations/processed_study.h',
+        'variations/proto/chrome_experiments.proto',
         'variations/proto/permuted_entropy_cache.proto',
         'variations/proto/study.proto',
         'variations/proto/variations_seed.proto',
         'variations/study_filtering.cc',
         'variations/study_filtering.h',
         'variations/variations_associated_data.cc',
         'variations/variations_associated_data.h',
+        'variations/variations_http_header_provider.cc',
+        'variations/variations_http_header_provider.h',
         'variations/variations_seed_processor.cc',
         'variations/variations_seed_processor.h',
         'variations/variations_seed_simulator.cc',
         'variations/variations_seed_simulator.h',
       ],
       'variables': {
         'proto_in_dir': 'variations/proto',
         'proto_out_dir': 'components/variations/proto',
       },
       'includes': [ '../build/protoc.gypi' ],
@@ skipping 28 matching lines @@
           ],
           'variables': {
             'jni_gen_package': 'variations',
           },
           'includes': [ '../build/jni_generator.gypi' ],
         },
       ],
     }],
   ]
 }