Fix test failure due to missing proguard rule.

Test
Ran failing test on userdebug build:
$ adb shell am instrument -e class \
  com.android.contacts.NoPermissionsLaunchSmokeTest -w \
  com.google.android.contacts.tests/android.support.test.runner.AndroidJUnitRunner

Change-Id: Ib699d24767ed87ecc9c0d3954f08c35f2542d1e6