[Clean up] Move VariationsHttpHeaderProvider into a subdirectory.

chrome/browser/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//components/nacl/nacl_defines.gni")
 # //build/config/android/rules.gni imports //tools/grit/grit_rule.gni, which
 # produces a conflict for the "grit" template so we have to only include one.
@@ skipping 95 matching lines @@
     "//components/search_provider_logos",
     "//components/signin/core/browser",
     "//components/startup_metric_utils",
     "//components/strings",
     "//components/suggestions",
     "//components/sync_driver",
     "//components/translate/core/browser",
     "//components/translate/core/common",
     "//components/url_fixer",
     "//components/user_prefs",
+    "//components/variations",
+    "//components/variations/net:variations_http_provider",
     "//components/webdata/common",
     "//content/public/browser",
     "//content/public/common",
     "//courgette:courgette_lib",
     "//crypto",
     "//google_apis",
     "//gpu/config",
     "//jingle:notifier",
     "//skia",
     "//sql",
@@ skipping 815 matching lines @@
     ]
   }
 
   if (enable_wifi_bootstrapping) {
     sources += [
       "local_discovery/wifi/mock_wifi_manager.cc",
       "local_discovery/wifi/mock_wifi_manager.h",
     ]
   }
 }