Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/java/core/src/main/java/com/google/protobuf/ProtobufArrayList.java

Index: third_party/protobuf/java/core/src/main/java/com/google/protobuf/ProtobufArrayList.java
diff --git a/third_party/protobuf/java/src/main/java/com/google/protobuf/ProtobufArrayList.java b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/ProtobufArrayList.java
similarity index 85%
copy from third_party/protobuf/java/src/main/java/com/google/protobuf/ProtobufArrayList.java
copy to third_party/protobuf/java/core/src/main/java/com/google/protobuf/ProtobufArrayList.java
index d2f82ac5135b3664770afc8968c6fd5873541f70..81255ec29125ba032f52b114f914b00f20a8e978 100644
--- a/third_party/protobuf/java/src/main/java/com/google/protobuf/ProtobufArrayList.java
+++ b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/ProtobufArrayList.java
@@ -38,7 +38,7 @@ import java.util.List;
 /**
  * Implements {@link ProtobufList} for non-primitive and {@link String} types.
  */
-class ProtobufArrayList<E> extends AbstractProtobufList<E> {
+final class ProtobufArrayList<E> extends AbstractProtobufList<E> {
 
   private static final ProtobufArrayList<Object> EMPTY_LIST = new ProtobufArrayList<Object>();
   static {
@@ -51,17 +51,23 @@ class ProtobufArrayList<E> extends AbstractProtobufList<E> {
   }
   
   private final List<E> list;
-  
+
   ProtobufArrayList() {
-    list = new ArrayList<E>();
+    this(new ArrayList<E>(DEFAULT_CAPACITY));
   }
   
-  ProtobufArrayList(List<E> toCopy) {
-    list = new ArrayList<E>(toCopy);
+  private ProtobufArrayList(List<E> list) {
+    this.list = list;
   }
-  
-  ProtobufArrayList(int capacity) {
-    list = new ArrayList<E>(capacity);
+
+  @Override
+  public ProtobufArrayList<E> mutableCopyWithCapacity(int capacity) {
+    if (capacity < size()) {
+      throw new IllegalArgumentException();
+    }
+    List<E> newList = new ArrayList<E>(capacity);
+    newList.addAll(list);
+    return new ProtobufArrayList<E>(newList);
   }
   
   @Override