[Clean up] Move VariationsHttpHeaderProvider into a subdirectory.

components/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 # Collection of all components. You wouldn't link to this, but this is rather
 # to reference the files so they can be compiled by the build system.
 group("all_components") {
@@ skipping 208 matching lines @@
     "//components/captive_portal:unit_tests",
     "//components/cloud_devices/common:unit_tests",
     "//components/component_updater:unit_tests",
     "//components/content_settings/core/browser:unit_tests",
     "//components/content_settings/core/common:unit_tests",
     "//components/crx_file:unit_tests",
     "//components/data_reduction_proxy/core/browser:unit_tests",
     "//components/data_reduction_proxy/core/common:unit_tests",
     "//components/dom_distiller/core:unit_tests",
     "//components/domain_reliability:unit_tests",
+    "//components/metrics:unit_tests",
     "//components/omnibox:unit_tests",
     "//components/ownership:unit_tests",
     "//components/proximity_auth:unit_tests",
+    "//components/variations:unit_tests",
   ]
 
   # TODO(GYP) need this target.
   #'breakpad/app/crash_keys_win_unittest.cc',
 
   # Precache tests need these defines.
   #configs += [ "//components/precache/core:precache_config" ]
 }
 
 }