Use external/robolectric-shadows/run_robotests.mk

This allows Settings to test against the latest framework changes.

Also replaced TestConfig with traditional robolectric.properties.

Bug: 73173204
Bug: 73892008
Test: make -j56 RunSettingsRoboTests
Change-Id: I3135b4fa5f095ba79b282a76f45dd9baa2584bc7

tests/robotests/src/com/android/settings/development/UsbAudioRoutingPreferenceControllerTest.java

@@ -17,7 +17,6 @@
 package com.android.settings.development;
 
 import static com.google.common.truth.Truth.assertThat;
-
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
@@ -26,7 +25,6 @@ import android.provider.Settings;
 import android.support.v14.preference.SwitchPreference;
 import android.support.v7.preference.PreferenceScreen;
 
-import com.android.settings.TestConfig;
 import com.android.settings.testutils.SettingsRobolectricTestRunner;
 
 import org.junit.Before;
@@ -35,10 +33,8 @@ import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 import org.robolectric.RuntimeEnvironment;
-import org.robolectric.annotation.Config;
 
 @RunWith(SettingsRobolectricTestRunner.class)
-@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
 public class UsbAudioRoutingPreferenceControllerTest {
 
     @Mock