Clear settingsProvider in PreloadAppsInstallerTest.

Bug: 38437704
Test: adb shell am instrument -e class com.android.server.retaildemo.PreloadAppsInstallerTest -w
      com.android.frameworks.servicestests/android.support.test.runner.AndroidJUnitRunner

Change-Id: Idc608de026ed02336250d4ba15f70dae67ee06a4
1 file changed