Convert FieldTrialActivated to use mojo.

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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 363 matching lines @@
     "favicon/chrome_favicon_client.cc",
     "favicon/chrome_favicon_client.h",
     "favicon/fallback_icon_service_factory.cc",
     "favicon/fallback_icon_service_factory.h",
     "favicon/favicon_service_factory.cc",
     "favicon/favicon_service_factory.h",
     "favicon/favicon_utils.cc",
     "favicon/favicon_utils.h",
     "favicon/large_icon_service_factory.cc",
     "favicon/large_icon_service_factory.h",
+    "field_trial_recorder.cc",
+    "field_trial_recorder.h",
     "file_select_helper.cc",
     "file_select_helper.h",
     "file_select_helper_mac.mm",
     "fullscreen.h",
     "fullscreen_chromeos.cc",
     "fullscreen_mac.mm",
     "fullscreen_win.cc",
     "geolocation/chrome_access_token_store.cc",
     "geolocation/chrome_access_token_store.h",
     "geolocation/geolocation_permission_context.cc",
@@ skipping 4017 matching lines @@
   # linking all of the test support.
   static_library("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }