Remove redundant public interface method declaration in JavaHL.

[in subversion/bindings/javahl/src/org/apache/subversion/javahl]
* callback/RemoteFileRevisionsCallback.java
  (RemoteFileRevisionsCallback.doRevision): Remove public declaration from
   interface method -- it's the defult.
* callback/RemoteLocationSegmentsCallback.java
  (RemoteLocationSegmentsCallback.doSegment): Remove public declaration from
   interface method -- it's the defult.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1510925 13f79535-47bb-0310-9956-ffa450edef68