Update //third_party/protobuf to version 3.

third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/WrappersPartial.cs

Index: third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/WrappersPartial.cs
diff --git a/third_party/protobuf/src/google/protobuf/unittest_lite_imports_nonlite.proto b/third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/WrappersPartial.cs
similarity index 79%
copy from third_party/protobuf/src/google/protobuf/unittest_lite_imports_nonlite.proto
copy to third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/WrappersPartial.cs
index d52cb8cc36d8924a3454f9170f6b338f14a59c5c..9f620eb4012e35421383ce544f51d7087f4100a1 100644
--- a/third_party/protobuf/src/google/protobuf/unittest_lite_imports_nonlite.proto
+++ b/third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/WrappersPartial.cs
@@ -1,6 +1,7 @@
+#region Copyright notice and license
 // 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
@@ -27,17 +28,15 @@
 // 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.
+#endregion
 
-// Author: kenton@google.com (Kenton Varda)
-//
-// Tests that a "lite" message can import a regular message.
-
-package protobuf_unittest;
-
-import "google/protobuf/unittest.proto";
-
-option optimize_for = LITE_RUNTIME;
-
-message TestLiteImportsNonlite {
-  optional TestAllTypes message = 1;
+namespace Google.Protobuf.WellKnownTypes
+{
+    public static partial class WrappersReflection
+    {
+        /// <summary>
+        /// Field number for the single "value" field in all wrapper types.
+        /// </summary>
+        internal const int WrapperValueFieldNumber = Int32Value.ValueFieldNumber;
+    }
 }