Revert of Remove NPAPI plugin from chromoting webapp.

remoting/host/plugin/host_plugin_utils.cc

+// Copyright (c) 2012 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 "remoting/host/plugin/host_plugin_utils.h"
+
+namespace remoting {
+
+NPNetscapeFuncs* g_npnetscape_funcs = NULL;
+
+std::string StringFromNPIdentifier(NPIdentifier identifier) {
+  if (!g_npnetscape_funcs->identifierisstring(identifier))
+    return std::string();
+  NPUTF8* np_string = g_npnetscape_funcs->utf8fromidentifier(identifier);
+  std::string string(np_string);
+  g_npnetscape_funcs->memfree(np_string);
+  return string;
+}
+
+std::string StringFromNPVariant(const NPVariant& variant) {
+  if (!NPVARIANT_IS_STRING(variant))
+    return std::string();
+  const NPString& np_string = NPVARIANT_TO_STRING(variant);
+  return std::string(np_string.UTF8Characters, np_string.UTF8Length);
+}
+
+NPVariant NPVariantFromString(const std::string& val) {
+  size_t len = val.length();
+  NPUTF8* chars =
+      reinterpret_cast<NPUTF8*>(g_npnetscape_funcs->memalloc(len + 1));
+  strcpy(chars, val.c_str());
+  NPVariant variant;
+  STRINGN_TO_NPVARIANT(chars, len, variant);
+  return variant;
+}
+
+NPObject* ObjectFromNPVariant(const NPVariant& variant) {
+  if (!NPVARIANT_IS_OBJECT(variant))
+    return NULL;
+  return NPVARIANT_TO_OBJECT(variant);
+}
+
+ScopedRefNPObject::ScopedRefNPObject() : object_(NULL) { }
+
+ScopedRefNPObject::ScopedRefNPObject(NPObject* object)
+    : object_(NULL) {
+  *this = object;
+}
+
+ScopedRefNPObject::ScopedRefNPObject(const ScopedRefNPObject& object)
+    : object_(NULL) {
+  *this = object;
+}
+
+ScopedRefNPObject::~ScopedRefNPObject() {
+  *this = NULL;
+}
+
+ScopedRefNPObject& ScopedRefNPObject::operator=(NPObject* object) {
+  if (object) {
+    g_npnetscape_funcs->retainobject(object);
+  }
+  if (object_) {
+    g_npnetscape_funcs->releaseobject(object_);
+  }
+  object_ = object;
+  return *this;
+}
+
+ScopedRefNPObject& ScopedRefNPObject::operator=(
+    const ScopedRefNPObject& object) {
+  return *this = object.get();
+}
+
+}  // namespace remoting