Remove unnecessary "throws" declarations

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

java/google/registry/tools/ServerSideCommand.java

@@ -25,7 +25,7 @@ interface ServerSideCommand extends RemoteApiCommand {
   /** An http connection to AppEngine. */
   interface Connection {
 
-    void prefetchXsrfToken() throws IOException;
+    void prefetchXsrfToken();
 
     String send(String endpoint, Map<String, ?> params, MediaType contentType, byte[] payload)
         throws IOException;