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

third_party/protobuf/python/google/protobuf/__init__.py

Index: third_party/protobuf/python/google/protobuf/__init__.py
diff --git a/third_party/protobuf/python/google/protobuf/__init__.py b/third_party/protobuf/python/google/protobuf/__init__.py
index 533821c16a3a4e39005ed2d44d9abf24cb864d1a..2a3c6771a0f7800d715e9c58b78c02931d01e620 100755
--- a/third_party/protobuf/python/google/protobuf/__init__.py
+++ b/third_party/protobuf/python/google/protobuf/__init__.py
@@ -30,4 +30,10 @@
 
 # Copyright 2007 Google Inc. All Rights Reserved.
 
-__version__ = '3.0.0b2'
+__version__ = '3.0.0b3'
+
+if __name__ != '__main__':
+  try:
+    __import__('pkg_resources').declare_namespace(__name__)
+  except ImportError:
+    __path__ = __import__('pkgutil').extend_path(__path__, __name__)