diff --git a/google/protobuf/compiler/java/message_serialization_unittest.proto b/google/protobuf/compiler/java/message_serialization_unittest.proto
deleted file mode 100644
index 9cfdf42b3253..000000000000
--- a/google/protobuf/compiler/java/message_serialization_unittest.proto
+++ /dev/null
@@ -1,56 +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.
-
-syntax = "proto2";
-
-package protobuf_unittest;
-
-option java_multiple_files = true;
-option java_package = "";
-
-// Each batch of extension ranges not separated by a non-extension field should
-// be serialized using a single ExtensionWriter#writeUntil call.
-message TestMessageWithManyExtensionRanges {
-  // First extension range: ends at field number 3 (exclusive)
-  extensions 1 to 2;
-
-  optional int32 foo = 3;
-  optional int32 bar = 5;
-
-  // Second extension range: ends at field number 13 (exclusive)
-  extensions 6;
-  extensions 8;
-  extensions 10 to 12;
-
-  optional int32 baz = 23;
-
-  // Third extension range: ends at field number 43 (exclusive)
-  extensions 42;
-}