Move classes only used by lite gen code to package private.

Author: blakeli0

protobuf-api/src/main/java/com/google/protobuf/GeneratedMessageLite.java

@@ -34,7 +34,7 @@
  *
  * @author [email protected] Kenton Varda
  */
-public abstract class GeneratedMessageLite<
+abstract class GeneratedMessageLite<
         MessageType extends GeneratedMessageLite<MessageType, BuilderType>,
         BuilderType extends GeneratedMessageLite.Builder<MessageType, BuilderType>>
     extends AbstractMessageLite<MessageType, BuilderType> {

protobuf-api/src/main/java/com/google/protobuf/LazyFieldLite.java

@@ -30,7 +30,7 @@
  *
  * @author [email protected] (Xiang Li)
  */
-public class LazyFieldLite {
+class LazyFieldLite {
   private static final ExtensionRegistryLite EMPTY_REGISTRY =
       ExtensionRegistryLite.getEmptyRegistry();
 

protobuf-api/src/main/java/com/google/protobuf/MapEntryLite.java

@@ -19,7 +19,7 @@
  *
  * <p>Protobuf internal. Users shouldn't use.
  */
-public class MapEntryLite<K, V> {
+class MapEntryLite<K, V> {
 
   static class Metadata<K, V> {
     public final WireFormat.FieldType keyType;

protobuf-api/src/main/java/com/google/protobuf/MapFieldLite.java

@@ -21,7 +21,7 @@
  *
  * <p>This class is a protobuf implementation detail. Users shouldn't use this class directly.
  */
-public final class MapFieldLite<K, V> extends LinkedHashMap<K, V> {
+final class MapFieldLite<K, V> extends LinkedHashMap<K, V> {
 
   private boolean isMutable;
 

protobuf-api/src/main/java/com/google/protobuf/UnknownFieldSetLite.java

@@ -20,7 +20,7 @@
  *
  * @author [email protected] (Daniel Weis)
  */
-public final class UnknownFieldSetLite {
+final class UnknownFieldSetLite {
 
   // Arbitrarily chosen.
   // TODO: Tune this number?