Check whether the Pepper CDM is available before adding the key system.

content/browser/plugin_service_impl.h

 // 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.
 
 // This class responds to requests from renderers for the list of plugins, and
 // also a proxy object for plugin instances.
 
 #ifndef CONTENT_BROWSER_PLUGIN_SERVICE_IMPL_H_
 #define CONTENT_BROWSER_PLUGIN_SERVICE_IMPL_H_
 
@@ skipping 78 matching lines @@
                              bool* is_stale,
                              WebPluginInfo* info,
                              std::string* actual_mime_type) OVERRIDE;
   virtual bool GetPluginInfoByPath(const base::FilePath& plugin_path,
                                    WebPluginInfo* info) OVERRIDE;
   virtual string16 GetPluginDisplayNameByPath(
       const base::FilePath& path) OVERRIDE;
   virtual void GetPlugins(const GetPluginsCallback& callback) OVERRIDE;
   virtual PepperPluginInfo* GetRegisteredPpapiPluginInfo(
       const base::FilePath& plugin_path) OVERRIDE;
+  virtual bool IsPepperPluginRegisteredForMimeType(
+      const std::string& mime_type) OVERRIDE;
   virtual void SetFilter(PluginServiceFilter* filter) OVERRIDE;
   virtual PluginServiceFilter* GetFilter() OVERRIDE;
   virtual void ForcePluginShutdown(const base::FilePath& plugin_path) OVERRIDE;
   virtual bool IsPluginUnstable(const base::FilePath& plugin_path) OVERRIDE;
   virtual void RefreshPlugins() OVERRIDE;
   virtual void AddExtraPluginPath(const base::FilePath& path) OVERRIDE;
   virtual void RemoveExtraPluginPath(const base::FilePath& path) OVERRIDE;
   virtual void AddExtraPluginDir(const base::FilePath& path) OVERRIDE;
   virtual void RegisterInternalPlugin(
       const WebPluginInfo& info, bool add_at_beginning) OVERRIDE;
@@ skipping 135 matching lines @@
 
   // Used to detect if a given plug-in is crashing over and over.
   std::map<base::FilePath, std::vector<base::Time> > crash_times_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginServiceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_PLUGIN_SERVICE_IMPL_H_