Reset user data directory and disk cache directory after downgrade.

chrome/test/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/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
@@ skipping 1135 matching lines @@
         "../browser/media/webrtc_simulcast_browsertest.cc",
         "../browser/media/webrtc_video_quality_browsertest.cc",
         "../browser/media/webrtc_webcam_browsertest.cc",
       ]
     }
     if (enable_media_router) {
       sources += [ "../browser/ui/webui/media_router/media_router_dialog_controller_impl_browsertest.cc" ]
       deps += [ "//chrome/test/media_router:media_router_browsertests" ]
     }
     if (is_win) {
+      sources += [ "../browser/downgrade/user_data_downgrade_browsertest.cc" ]
       deps += [
         "//chrome:other_version",
         "//third_party/wtl",
         "//ui/resources",
       ]
     } else {
       sources -= [
         "../app/chrome_command_ids.h",
         "../app/chrome_dll_resource.h",
         "../app/chrome_version.rc.version",
@@ skipping 1181 matching lines @@
 if (is_android) {
   android_library("unit_tests_java") {
     java_files = [ "android/unit_tests_apk/src/org/chromium/chrome/unit_tests_apk/ChromeNativeTestApplication.java" ]
     deps = [
       "//base:base_java",
       "//chrome/android:chrome_java",
       "//content/public/android:content_java",
     ]
   }
 }