Update protobuf to r428, part 1.

third_party/protobuf/src/google/protobuf/stubs/common.cc

Index: third_party/protobuf/src/google/protobuf/stubs/common.cc
===================================================================
--- third_party/protobuf/src/google/protobuf/stubs/common.cc	(revision 216642)
+++ third_party/protobuf/src/google/protobuf/stubs/common.cc	(working copy)
@@ -320,6 +320,24 @@
 #endif
 
 // ===================================================================
+// emulates google3/util/endian/endian.h
+//
+// TODO(xiaofeng): PROTOBUF_LITTLE_ENDIAN is unfortunately defined in
+// google/protobuf/io/coded_stream.h and therefore can not be used here.
+// Maybe move that macro definition here in the furture.
+uint32 ghtonl(uint32 x) {
+  union {
+    uint32 result;
+    uint8 result_array[4];
+  };
+  result_array[0] = static_cast<uint8>(x >> 24);
+  result_array[1] = static_cast<uint8>((x >> 16) & 0xFF);
+  result_array[2] = static_cast<uint8>((x >> 8) & 0xFF);
+  result_array[3] = static_cast<uint8>(x & 0xFF);
+  return result;
+}
+
+// ===================================================================
 // Shutdown support.
 
 namespace internal {