Update //third_party/protobuf to version 3.

third_party/protobuf/WORKSPACE

Index: third_party/protobuf/WORKSPACE
diff --git a/third_party/protobuf/WORKSPACE b/third_party/protobuf/WORKSPACE
new file mode 100644
index 0000000000000000000000000000000000000000..c3f18cc7b74ffc3cede4c9dcb4decf4c323b969b
--- /dev/null
+++ b/third_party/protobuf/WORKSPACE
@@ -0,0 +1,28 @@
+new_http_archive(
+  name = "gmock_archive",
+  url = "https://googlemock.googlecode.com/files/gmock-1.7.0.zip",
+  sha256 = "26fcbb5925b74ad5fc8c26b0495dfc96353f4d553492eb97e85a8a6d2f43095b",
+  build_file = "gmock.BUILD",
+)
+
+new_http_archive(
+  name = "six_archive",
+  url = "https://pypi.python.org/packages/source/s/six/six-1.10.0.tar.gz#md5=34eed507548117b2ab523ab14b2f8b55",
+  sha256 = "105f8d68616f8248e24bf0e9372ef04d3cc10104f1980f54d57b2ce73a5ad56a",
+  build_file = "six.BUILD",
+)
+
+bind(
+  name = "gtest",
+  actual = "@gmock_archive//:gtest",
+)
+
+bind(
+  name = "gtest_main",
+  actual = "@gmock_archive//:gtest_main",
+)
+
+bind(
+  name = "six",
+  actual = "@six_archive//:six",
+)