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

third_party/protobuf/ruby/travis-test.sh

Index: third_party/protobuf/ruby/travis-test.sh
diff --git a/third_party/protobuf/ruby/travis-test.sh b/third_party/protobuf/ruby/travis-test.sh
index 1b53dd789f2f0a143ef314a3f32194cc5338f129..75db7d931f7f4627f4f6890c356cda4ee7a0f80b 100755
--- a/third_party/protobuf/ruby/travis-test.sh
+++ b/third_party/protobuf/ruby/travis-test.sh
@@ -17,11 +17,8 @@ test_version() {
       "rvm install $version && rvm use $version && \
        which ruby && \
        gem install bundler && bundle && \
-       rake test"
-    # TODO(xiaofeng): Conformance tests are disabled because the ruby testee
-    # program crashes on some inputs.
-    #  cd ../conformance && \
-    #  make test_ruby
+       rake test &&
+       cd ../conformance && make test_ruby"
   fi
 }