third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/javanano/src/main/java/com/google/protobuf/nano/InternalNano.java

 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
@@ skipping 49 matching lines @@
   public static final int TYPE_GROUP    = 10;
   public static final int TYPE_MESSAGE  = 11;
   public static final int TYPE_BYTES    = 12;
   public static final int TYPE_UINT32   = 13;
   public static final int TYPE_ENUM     = 14;
   public static final int TYPE_SFIXED32 = 15;
   public static final int TYPE_SFIXED64 = 16;
   public static final int TYPE_SINT32   = 17;
   public static final int TYPE_SINT64   = 18;
 
-  protected static final Charset UTF_8 = Charset.forName("UTF-8");
-  protected static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
+  static final Charset UTF_8 = Charset.forName("UTF-8");
+  static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
 
   private InternalNano() {}
 
   /**
    * An object to provide synchronization when lazily initializing static fields
    * of {@link MessageNano} subclasses.
    * <p>
    * To enable earlier versions of ProGuard to inline short methods from a
    * generated MessageNano subclass to the call sites, that class must not have
    * a class initializer, which will be created if there is any static variable
@@ skipping 456 matching lines @@
   }
 
   // This avoids having to make FieldArray public.
   public static void cloneUnknownFieldData(ExtendableMessageNano original,
       ExtendableMessageNano cloned) {
     if (original.unknownFieldData != null) {
       cloned.unknownFieldData = (FieldArray) original.unknownFieldData.clone();
     }
   }
 }