Run instrumentation tests with the default runner

This migrates all tests that work by just changing their runner.

This excludes tests using `@RunWith(ParameterizedRunner.class)`, and a
few other non-parameterized tests that fail with the default runner.

Bug: webrtc:13662
Change-Id: Ia0b7c80e04a6a6b7a51348b3a7f587d10061b58e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/256367
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Xavier Lepaul‎ <xalep@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36298}

sdk/android/instrumentationtests/src/org/webrtc/RtpSenderTest.java

@@ -19,14 +19,11 @@ import static org.mockito.Mockito.mock;
 import android.support.test.InstrumentationRegistry;
 import androidx.test.filters.SmallTest;
 import java.util.Arrays;
-import org.chromium.base.test.BaseJUnit4ClassRunner;
 import org.junit.Before;
 import org.junit.Test;
-import org.junit.runner.RunWith;
 import org.webrtc.RtpParameters.DegradationPreference;
 
 /** Unit-tests for {@link RtpSender}. */
-@RunWith(BaseJUnit4ClassRunner.class)
 public class RtpSenderTest {
   private PeerConnectionFactory factory;
   private PeerConnection pc;