PPAPI: Make GetProxiedInterface not re-enter the plugin

ppapi/proxy/plugin_dispatcher.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.
 
 #ifndef PPAPI_PROXY_PLUGIN_DISPATCHER_H_
 #define PPAPI_PROXY_PLUGIN_DISPATCHER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 157 matching lines @@
   bool incognito() const { return incognito_; }
 
  private:
   friend class PluginDispatcherTest;
 
   // Notifies all live instances that they're now closed. This is used when
   // a renderer crashes or some other error is received.
   void ForceFreeAllInstances();
 
   // IPC message handlers.
-  void OnMsgSupportsInterface(const std::string& interface_name, bool* result);
+  void OnMsgIsInterfaceSupported(
+      const std::string& interface_name, bool* result);
   void OnMsgSetPreferences(const Preferences& prefs);
 
   virtual bool SendMessage(IPC::Message* msg);
 
   PluginDelegate* plugin_delegate_;
 
   // Contains all the plugin interfaces we've queried. The mapped value will
   // be the pointer to the interface pointer supplied by the plugin if it's
   // supported, or NULL if it's not supported. This allows us to cache failures
   // and not req-query if a plugin doesn't support the interface.
@@ skipping 17 matching lines @@
   // A filter for sending messages from threads other than the main thread.
   scoped_refptr<IPC::SyncMessageFilter> sync_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginDispatcher);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PLUGIN_DISPATCHER_H_