Remove unnecessary "throws" declarations

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

javatests/google/registry/xjc/XmlTestdataTest.java

@@ -145,7 +145,7 @@ public class XmlTestdataTest {
   }
 
   @Theory
-  public void testInvalid(Evil v) throws Exception {
+  public void testInvalid(Evil v) {
     Throwable thrown = assertThrows(Throwable.class, () -> unmarshal(XjcObject.class, v.xmlStream));
     assertThat(thrown).hasMessageThat().contains(v.error);
   }