Remove Java deterministic API.

Change-Id: I43f7e04a53d1445dfa86db310bdb18ceb446398c

CHANGES.txt

 2016-07-15 version 3.0.0-beta-4 (C++/Java/Python/Ruby/Objective-C/C#/JavaScript)
   General
-  * Added a deterministic serialization API for C++ and Java. The deterministic
+  * Added a deterministic serialization API for C++. The deterministic
     serialization guarantees that given a binary, equal messages will be
     serialized to the same bytes. This allows applications like MapReduce to
     group equal messages based on the serialized bytes. The deterministic
@@ -36,9 +36,6 @@
   * Various performance optimizations.
 
   Java (beta)
-  * Introduced a deterministic serialization API in
-    CodedOutputStream#useDeterministicSerialization(). See the notes about
-    deterministic serialization in the General section.
   * File option "java_generate_equals_and_hash" is now deprecated. equals() and
     hashCode() methods are generated by default.
   * Added a new JSON printer option "omittingInsignificantWhitespace" to produce

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

@@ -173,7 +173,7 @@ public abstract class CodedOutputStream extends ByteOutput {
    *     maps are sorted on the lexicographical order of the UTF8 encoded keys.
    * </ul>
    */
-  public final void useDeterministicSerialization() {
+  void useDeterministicSerialization() {
     serializationDeterministic = true;
   }