Move SettingsRobolectricTestRunner to testutils.

Change-Id: Ia0017983b844cabafc10478adf4839f5755f514c
Merged-In: I6612b1f26404587301c534c8ba60e39d59d6c840
Fixes: 67688380
Test: robotests

tests/robotests/src/com/android/settings/LicenseHtmlLoaderTest.java

@@ -27,9 +27,10 @@ import static org.mockito.Mockito.when;
 
 import android.content.Context;
 
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
 import java.io.File;
 import java.util.ArrayList;
-import java.util.List;
 
 import org.junit.Before;
 import org.junit.Test;