Removed google-internal annotation.

java/core/src/main/java/com/google/protobuf/TextFormat.java

@@ -446,11 +446,6 @@ public final class TextFormat {
 
     /**
      * An adapter class that can take a {@link MapEntry} and returns its key and entry.
-     * BEGIN GOOGLE-INTERNAL
-     * This class is created solely for the purpose of sorting map entries by its
-     * key and prevent duplicated logic by having a separate comparator for {@link MapEntry} and
-     * {@link MutableMapEntry}.
-     * END GOOGLE-INTERNAL
      */
     private static class MapEntryAdapter implements Comparable<MapEntryAdapter> {
       private Object entry;