Remove unnecessary "throws" declarations

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

javatests/google/registry/tools/server/PollMapreduceActionTest.java

@@ -35,7 +35,7 @@ import org.junit.runners.JUnit4;
 public class PollMapreduceActionTest extends MapreduceTestCase<PollMapreduceAction> {
 
   @Before
-  public void init() throws Exception {
+  public void init() {
     action = new PollMapreduceAction();
   }