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

third_party/protobuf/src/google/protobuf/util/internal/testdata/books.proto

Index: third_party/protobuf/src/google/protobuf/util/internal/testdata/books.proto
diff --git a/third_party/protobuf/src/google/protobuf/util/internal/testdata/books.proto b/third_party/protobuf/src/google/protobuf/util/internal/testdata/books.proto
index 82b8176066f4c546ff70a66360bc1da2ca39a5a6..1cbbba4781f04997e03cde5baeb18e38136dda08 100644
--- a/third_party/protobuf/src/google/protobuf/util/internal/testdata/books.proto
+++ b/third_party/protobuf/src/google/protobuf/util/internal/testdata/books.proto
@@ -56,6 +56,13 @@ message Book {
   optional Publisher publisher = 9;
   repeated Label labels = 10;
 
+  enum Type {
+    FICTION = 1;
+    KIDS = 2;
+    ACTION_AND_ADVENTURE = 3;
+  }
+  optional Type type = 11;
+
   extensions 200 to 499;
 }
 
@@ -169,3 +176,12 @@ message NestedBook {
 message BadNestedBook {
   repeated uint32 book = 1 [packed=true];  // Packed to optional message.
 }
+
+// A recursively defined message.
+message Cyclic {
+  optional int32 m_int = 1;
+  optional string m_str = 2;
+  optional Book m_book = 3;
+  repeated Author m_author = 5;
+  optional Cyclic m_cyclic = 4;
+}