Remove unnecessary "throws" declarations

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

javatests/google/registry/config/RegistryEnvironmentTest.java

@@ -23,7 +23,7 @@ import org.junit.runners.JUnit4;
 public class RegistryEnvironmentTest {
 
   @Test
-  public void testGet() throws Exception {
+  public void testGet() {
     RegistryEnvironment.get();
   }
 }