Automatically refactor more exception testing to use new JUnit rules

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=178911894

javatests/google/registry/request/lock/LockHandlerImplTest.java

@@ -29,7 +29,6 @@ import org.joda.time.Duration;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
-import org.junit.rules.ExpectedException;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
@@ -43,9 +42,6 @@ public final class LockHandlerImplTest {
   public final AppEngineRule appEngine = AppEngineRule.builder()
       .build();
 
-  @Rule
-  public final ExpectedException thrown = ExpectedException.none();
-
   private static class CountingCallable implements Callable<Void> {
     int numCalled = 0;