Create default implementations of ContentRendererClient, ContentUtilityClient, and ContentPluginCli…

content/public/utility/content_utility_client.cc

Index: content/public/utility/content_utility_client.cc
===================================================================
--- content/public/utility/content_utility_client.cc	(revision 0)
+++ content/public/utility/content_utility_client.cc	(revision 0)
@@ -0,0 +1,13 @@
+// Copyright (c) 2011 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 "content/public/utility/content_utility_client.h"
+
+namespace content {
+
+bool ContentUtilityClient::OnMessageReceived(const IPC::Message& message) {
+  return false;
+}
+
+}  // namespace content