Support custom message filtering on Mojo binding objects

mojo/public/cpp/bindings/lib/message_header_validator.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/public/cpp/bindings/message_header_validator.h"
 
 #include "mojo/public/cpp/bindings/lib/validation_context.h"
 #include "mojo/public/cpp/bindings/lib/validation_errors.h"
 #include "mojo/public/cpp/bindings/lib/validation_util.h"
 
@@ skipping 47 matching lines @@
         validation_context,
         internal::VALIDATION_ERROR_MESSAGE_HEADER_INVALID_FLAGS);
     return false;
   }
 
   return true;
 }
 
 }  // namespace
 
-MessageHeaderValidator::MessageHeaderValidator(MessageReceiver* sink)
-    : MessageHeaderValidator("MessageHeaderValidator", sink) {}
+MessageHeaderValidator::MessageHeaderValidator()
+    : MessageHeaderValidator("MessageHeaderValidator") {}
 
-MessageHeaderValidator::MessageHeaderValidator(const std::string& description,
-                                               MessageReceiver* sink)
-    : MessageFilter(sink), description_(description) {
+MessageHeaderValidator::MessageHeaderValidator(const std::string& description)
+    : description_(description) {
 }
 
 void MessageHeaderValidator::SetDescription(const std::string& description) {
   description_ = description;
 }
 
 bool MessageHeaderValidator::Accept(Message* message) {
   // Pass 0 as number of handles because we don't expect any in the header, even
   // if |message| contains handles.
   internal::ValidationContext validation_context(
       message->data(), message->data_num_bytes(), 0, message, description_);
 
   if (!internal::ValidateStructHeaderAndClaimMemory(message->data(),
                                                     &validation_context))
     return false;
 
   if (!IsValidMessageHeader(message->header(), &validation_context))
     return false;
 
-  return sink_->Accept(message);
+  return true;
 }
 
 }  // namespace mojo