Remove unnecessary "throws" declarations

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

javatests/google/registry/batch/RefreshDnsOnHostRenameActionTest.java

@@ -75,7 +75,7 @@ public class RefreshDnsOnHostRenameActionTest
   private final FakeClock clock = new FakeClock(DateTime.parse("2015-01-15T11:22:33Z"));
 
   @Before
-  public void setup() throws Exception {
+  public void setup() {
     createTld("tld");
     enqueuer =
         new AsyncFlowEnqueuer(