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

third_party/protobuf/java/src/main/java/com/google/protobuf/ProtocolStringList.java

Index: third_party/protobuf/java/src/main/java/com/google/protobuf/ProtocolStringList.java
diff --git a/third_party/protobuf/java/src/main/java/com/google/protobuf/ProtocolStringList.java b/third_party/protobuf/java/src/main/java/com/google/protobuf/ProtocolStringList.java
deleted file mode 100644
index d553b41e52bccc28a327950d20b2af98290d3273..0000000000000000000000000000000000000000
--- a/third_party/protobuf/java/src/main/java/com/google/protobuf/ProtocolStringList.java
+++ /dev/null
@@ -1,48 +0,0 @@
-// 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.
-//     * 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;
-
-import java.util.List;
-
-/**
- * An interface extending {@code List<String>} used for repeated string fields
- * to provide optional access to the data as a list of ByteStrings. The
- * underlying implementation stores values as either ByteStrings or Strings
- * (see {@link LazyStringArrayList}) depending on how the value was initialized
- * or last read, and it is often more efficient to deal with lists of
- * ByteStrings when handling protos that have been deserialized from bytes.
- */
-public interface ProtocolStringList extends List<String> {
-
-  /** Returns a view of the data as a list of ByteStrings. */
-  List<ByteString> asByteStringList();
-
-}