Fix some DCHECKS when using BrowserPlugin for extension mime type handlers

chrome/browser/extensions/plugin_manager.h

 // Copyright 2013 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_BROWSER_EXTENSIONS_PLUGIN_MANAGER_H_
 #define CHROME_BROWSER_EXTENSIONS_PLUGIN_MANAGER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 26 matching lines @@
 
   // We implement some Pepper plug-ins using NaCl to take advantage of NaCl's
   // strong sandbox. Typically, these NaCl modules are stored in extensions
   // and registered here. Not all NaCl modules need to register for a MIME
   // type, just the ones that are responsible for rendering a particular MIME
   // type, like application/pdf. Note: We only register NaCl modules in the
   // browser process.
   void RegisterNaClModule(const NaClModuleInfo& info);
   void UnregisterNaClModule(const NaClModuleInfo& info);
 
-  void RegisterMimeTypeHandler(const std::string& extension_id);
-  void UnregisterMimeTypeHandler(const std::string& extension_id);
-
   // Call UpdatePluginListWithNaClModules() after registering or unregistering
   // a NaCl module to see those changes reflected in the PluginList.
   void UpdatePluginListWithNaClModules();
 
   extensions::NaClModuleInfo::List::iterator FindNaClModule(const GURL& url);
 
   // ExtensionRegistryObserver implementation.
   virtual void OnExtensionLoaded(content::BrowserContext* browser_context,
                                  const Extension* extension) OVERRIDE;
   virtual void OnExtensionUnloaded(
       content::BrowserContext* browser_context,
       const Extension* extension,
       UnloadedExtensionInfo::Reason reason) OVERRIDE;
 
   // BrowserContextKeyedAPI implementation.
   static const char* service_name() { return "PluginManager"; }
   static const bool kServiceIsNULLWhileTesting = true;
 
   extensions::NaClModuleInfo::List nacl_module_list_;
 
-  // The set of extensions that are registered as the handler for at least one
-  // MIME type.
-  std::set<std::string> mime_type_handler_extension_ids_;
-
   Profile* profile_;
 
   // Listen to extension load, unloaded notifications.
   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
       extension_registry_observer_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_PLUGIN_MANAGER_H_