Update //third_party/protobuf to version 3.

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

Index: third_party/protobuf/java/src/main/java/com/google/protobuf/MessageLiteOrBuilder.java
diff --git a/third_party/protobuf/python/google/protobuf/internal/more_extensions_dynamic.proto b/third_party/protobuf/java/src/main/java/com/google/protobuf/MessageLiteOrBuilder.java
similarity index 59%
copy from third_party/protobuf/python/google/protobuf/internal/more_extensions_dynamic.proto
copy to third_party/protobuf/java/src/main/java/com/google/protobuf/MessageLiteOrBuilder.java
index df98ac4bd1929fda636c9e2fce1a9184ebf5d472..818386ce58922ea6d9a9593b9c1500f79167a6cd 100644
--- a/third_party/protobuf/python/google/protobuf/internal/more_extensions_dynamic.proto
+++ b/third_party/protobuf/java/src/main/java/com/google/protobuf/MessageLiteOrBuilder.java
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// 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
@@ -28,22 +28,33 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: jasonh@google.com (Jason Hsueh)
-//
-// This file is used to test a corner case in the CPP implementation where the
-// generated C++ type is available for the extendee, but the extension is
-// defined in a file whose C++ type is not in the binary.
-
+package com.google.protobuf;
 
-import "google/protobuf/internal/more_extensions.proto";
+/**
+ * Base interface for methods common to {@link MessageLite}
+ * and {@link MessageLite.Builder} to provide type equivalency.
+ *
+ * @author jonp@google.com (Jon Perlow)
+ */
+public interface MessageLiteOrBuilder {
+  /**
+   * Get an instance of the type with no fields set. Because no fields are set,
+   * all getters for singular fields will return default values and repeated
+   * fields will appear empty.
+   * This may or may not be a singleton.  This differs from the
+   * {@code getDefaultInstance()} method of generated message classes in that
+   * this method is an abstract method of the {@code MessageLite} interface
+   * whereas {@code getDefaultInstance()} is a static method of a specific
+   * class.  They return the same thing.
+   */
+  MessageLite getDefaultInstanceForType();
 
-package google.protobuf.internal;
-
-message DynamicMessageType {
-  optional int32 a = 1;
-}
+  /**
+   * Returns true if all required fields in the message and all embedded
+   * messages are set, false otherwise.
+   *
+   * <p>See also: {@link MessageOrBuilder#getInitializationErrorString()}
+   */
+  boolean isInitialized();
 
-extend ExtendedMessage {
-  optional int32 dynamic_int32_extension = 100;
-  optional DynamicMessageType dynamic_message_extension = 101;
 }