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

third_party/protobuf/src/google/protobuf/stubs/stringpiece.h

Index: third_party/protobuf/src/google/protobuf/stubs/stringpiece.h
diff --git a/third_party/protobuf/src/google/protobuf/stubs/stringpiece.h b/third_party/protobuf/src/google/protobuf/stubs/stringpiece.h
index ec3ffd5b06f0a9cb6300faa2255064aacce62497..9167165940d24e88cc29be0fe4de98a8579205ac 100644
--- a/third_party/protobuf/src/google/protobuf/stubs/stringpiece.h
+++ b/third_party/protobuf/src/google/protobuf/stubs/stringpiece.h
@@ -435,6 +435,44 @@ inline bool operator>=(StringPiece x, StringPiece y) {
 // allow StringPiece to be logged
 extern std::ostream& operator<<(std::ostream& o, StringPiece piece);
 
+namespace internal {
+// StringPiece is not a POD and can not be used in an union (pre C++11). We
+// need a POD version of it.
+struct StringPiecePod {
+  // Create from a StringPiece.
+  static StringPiecePod CreateFromStringPiece(StringPiece str) {
+    StringPiecePod pod;
+    pod.data_ = str.data();
+    pod.size_ = str.size();
+    return pod;
+  }
+
+  // Cast to StringPiece.
+  operator StringPiece() const { return StringPiece(data_, size_); }
+
+  bool operator==(const char* value) const {
+    return StringPiece(data_, size_) == StringPiece(value);
+  }
+
+  char operator[](stringpiece_ssize_type i) const {
+    assert(0 <= i);
+    assert(i < size_);
+    return data_[i];
+  }
+
+  const char* data() const { return data_; }
+
+  stringpiece_ssize_type size() const {
+    return size_;
+  }
+
+  std::string ToString() const { return std::string(data_, size_); }
+ private:
+  const char* data_;
+  stringpiece_ssize_type size_;
+};
+
+}  // namespace internal
 }  // namespace protobuf
 }  // namespace google