Revert https://codereview.chromium.org/1291903002 (protobuf roll).

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

Index: third_party/protobuf/javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java
diff --git a/third_party/protobuf/javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java b/third_party/protobuf/javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java
deleted file mode 100644
index b1678d1b93a0b63d0e9df35adc038c233c4fc10a..0000000000000000000000000000000000000000
--- a/third_party/protobuf/javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java
+++ /dev/null
@@ -1,88 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2013 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.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import java.io.IOException;
-import java.util.Arrays;
-
-/**
- * Stores unknown fields. These might be extensions or fields that the generated
- * API doesn't know about yet.
- *
- * @author bduff@google.com (Brian Duff)
- */
-final class UnknownFieldData {
-
-    final int tag;
-    /**
-     * Important: this should be treated as immutable, even though it's possible
-     * to change the array values.
-     */
-    final byte[] bytes;
-
-    UnknownFieldData(int tag, byte[] bytes) {
-        this.tag = tag;
-        this.bytes = bytes;
-    }
-
-    int computeSerializedSize() {
-        int size = 0;
-        size += CodedOutputByteBufferNano.computeRawVarint32Size(tag);
-        size += bytes.length;
-        return size;
-    }
-
-    void writeTo(CodedOutputByteBufferNano output) throws IOException {
-        output.writeRawVarint32(tag);
-        output.writeRawBytes(bytes);
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (o == this) {
-            return true;
-        }
-        if (!(o instanceof UnknownFieldData)) {
-            return false;
-        }
-
-        UnknownFieldData other = (UnknownFieldData) o;
-        return tag == other.tag && Arrays.equals(bytes, other.bytes);
-    }
-
-    @Override
-    public int hashCode() {
-        int result = 17;
-        result = 31 * result + tag;
-        result = 31 * result + Arrays.hashCode(bytes);
-        return result;
-    }
-}