Add a preference to force enable the NaCl plugin as we transition to

chrome/common/chrome_content_client.h

 // 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.
 
 #ifndef CHROME_COMMON_CHROME_CONTENT_CLIENT_H_
 #define CHROME_COMMON_CHROME_CONTENT_CLIENT_H_
 #pragma once
 
 #include "content/common/content_client.h"
 
 namespace chrome {
 
 class ChromeContentClient : public content::ContentClient {
  public:
   static const char* kPDFPluginName;
   static const char* kNaClPluginName;
+  static const char* kNaClOldPluginName;
 
   virtual void SetActiveURL(const GURL& url);
   virtual void SetGpuInfo(const GPUInfo& gpu_info);
   virtual void AddPepperPlugins(std::vector<PepperPluginInfo>* plugins);
   virtual bool CanSendWhileSwappedOut(const IPC::Message* msg);
   virtual bool CanHandleWhileSwappedOut(const IPC::Message& msg);
   virtual std::string GetUserAgent(bool mimic_windows) const;
   virtual string16 GetLocalizedString(int message_id) const;
   virtual base::StringPiece GetDataResource(int resource_id) const;
 
 #if defined(OS_WIN)
   virtual bool SandboxPlugin(CommandLine* command_line,
                              sandbox::TargetPolicy* policy);
 #endif
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_CHROME_CONTENT_CLIENT_H_