Fix a bunch of mojo_public_*_unittests with the new EDK.

mojo/public/cpp/bindings/lib/validation_errors.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/lib/validation_errors.h"
 
 #include "mojo/public/cpp/environment/logging.h"
 
 namespace mojo {
 namespace internal {
@@ skipping 48 matching lines @@
   if (g_validation_error_observer) {
     g_validation_error_observer->set_last_error(error);
   } else if (description) {
     MOJO_LOG(ERROR) << "Invalid message: " << ValidationErrorToString(error)
                     << " (" << description << ")";
   } else {
     MOJO_LOG(ERROR) << "Invalid message: " << ValidationErrorToString(error);
   }
 }
 
-ValidationErrorObserverForTesting::ValidationErrorObserverForTesting()
-    : last_error_(VALIDATION_ERROR_NONE) {
+ValidationErrorObserverForTesting::ValidationErrorObserverForTesting(
+    const Callback<void()>& callback)
+    : last_error_(VALIDATION_ERROR_NONE), callback_(callback) {
   MOJO_DCHECK(!g_validation_error_observer);
   g_validation_error_observer = this;
 }
 
 ValidationErrorObserverForTesting::~ValidationErrorObserverForTesting() {
   MOJO_DCHECK(g_validation_error_observer == this);
   g_validation_error_observer = nullptr;
 }
 
 bool ReportSerializationWarning(ValidationError error) {
@@ skipping 12 matching lines @@
 }
 
 SerializationWarningObserverForTesting::
     ~SerializationWarningObserverForTesting() {
   MOJO_DCHECK(g_serialization_warning_observer == this);
   g_serialization_warning_observer = nullptr;
 }
 
 }  // namespace internal
 }  // namespace mojo