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

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

Index: third_party/protobuf/java/src/main/java/com/google/protobuf/AbstractProtobufList.java
diff --git a/third_party/protobuf/java/src/main/java/com/google/protobuf/AbstractProtobufList.java b/third_party/protobuf/java/src/main/java/com/google/protobuf/AbstractProtobufList.java
deleted file mode 100644
index bb6446b2a255bbe1fa4adbb4555b45368281ba23..0000000000000000000000000000000000000000
--- a/third_party/protobuf/java/src/main/java/com/google/protobuf/AbstractProtobufList.java
+++ /dev/null
@@ -1,136 +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 com.google.protobuf.Internal.ProtobufList;
-
-import java.util.AbstractList;
-import java.util.Collection;
-
-/**
- * An abstract implementation of {@link ProtobufList} which manages mutability semantics. All mutate
- * methods are check if the list is mutable before proceeding. Subclasses must invoke
- * {@link #ensureIsMutable()} manually when overriding those methods.
- */
-abstract class AbstractProtobufList<E> extends AbstractList<E> implements ProtobufList<E> {
-
-  /**
-   * Whether or not this list is modifiable.
-   */
-  private boolean isMutable;
-  
-  /**
-   * Constructs a mutable list by default.
-   */
-  AbstractProtobufList() {
-    isMutable = true;
-  }
-
-  @Override
-  public boolean add(E e) {
-    ensureIsMutable();
-    return super.add(e);
-  }
-
-  @Override
-  public void add(int index, E element) {
-    ensureIsMutable();
-    super.add(index, element);
-  }
-
-  @Override
-  public boolean addAll(Collection<? extends E> c) {
-    ensureIsMutable();
-    return super.addAll(c);
-  }
-  
-  @Override
-  public boolean addAll(int index, Collection<? extends E> c) {
-    ensureIsMutable();
-    return super.addAll(index, c);
-  }
-
-  @Override
-  public void clear() {
-    ensureIsMutable();
-    super.clear();
-  }
-  
-  @Override
-  public boolean isModifiable() {
-    return isMutable;
-  }
-  
-  @Override
-  public final void makeImmutable() {
-    isMutable = false;
-  }
-  
-  @Override
-  public E remove(int index) {
-    ensureIsMutable();
-    return super.remove(index);
-  }
-  
-  @Override
-  public boolean remove(Object o) {
-    ensureIsMutable();
-    return super.remove(o);
-  }
-  
-  @Override
-  public boolean removeAll(Collection<?> c) {
-    ensureIsMutable();
-    return super.removeAll(c);
-  }
-  
-  @Override
-  public boolean retainAll(Collection<?> c) {
-    ensureIsMutable();
-    return super.retainAll(c);
-  }
-  
-  @Override
-  public E set(int index, E element) {
-    ensureIsMutable();
-    return super.set(index, element);
-  }
-  
-  /**
-   * Throws an {@link UnsupportedOperationException} if the list is immutable. Subclasses are
-   * responsible for invoking this method on mutate operations.
-   */
-  protected void ensureIsMutable() {
-    if (!isMutable) {
-      throw new UnsupportedOperationException();
-    }
-  }
-}