Revert Guava 20 features until we get the build working properly

*** Original change description ***

Remove deprecated methods with Guava 20 release

***

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=137945126

java/google/registry/model/server/Lock.java

@@ -193,8 +193,7 @@ public class Lock extends ImmutableObject {
           TimeUnit.MILLISECONDS,
           true);
     } catch (Exception e) {
-      Throwables.throwIfUnchecked(e);
-      throw new RuntimeException(e);
+      throw Throwables.propagate(e);
     }
   }