Remove unnecessary "throws" declarations

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201058582

javatests/google/registry/backup/CommitLogCheckpointActionTest.java

@@ -57,7 +57,7 @@ public class CommitLogCheckpointActionTest {
   CommitLogCheckpointAction task = new CommitLogCheckpointAction();
 
   @Before
-  public void before() throws Exception {
+  public void before() {
     task.clock = new FakeClock(now);
     task.strategy = strategy;
     task.taskQueueUtils = new TaskQueueUtils(new Retrier(null, 1));