Turn //mojo/public/cpp/bindings and //mojo/public/cpp/system into components

mojo/public/cpp/bindings/message_header_validator.h

Index: mojo/public/cpp/bindings/message_header_validator.h
diff --git a/mojo/public/cpp/bindings/message_header_validator.h b/mojo/public/cpp/bindings/message_header_validator.h
index 52f02087d63d1593fda2c3b2c7b3582cb68eb43a..50c19dbe048189d34960c5b3e44fa7c523d1c5a6 100644
--- a/mojo/public/cpp/bindings/message_header_validator.h
+++ b/mojo/public/cpp/bindings/message_header_validator.h
@@ -5,11 +5,14 @@
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_HEADER_VALIDATOR_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_HEADER_VALIDATOR_H_
 
+#include "base/compiler_specific.h"
+#include "mojo/public/cpp/bindings/bindings_export.h"
 #include "mojo/public/cpp/bindings/message.h"
 
 namespace mojo {
 
-class MessageHeaderValidator : public MessageReceiver {
+class MOJO_CPP_BINDINGS_EXPORT MessageHeaderValidator
+    : NON_EXPORTED_BASE(public MessageReceiver) {
  public:
   MessageHeaderValidator();
   explicit MessageHeaderValidator(const std::string& description);