Replace NPObject usage in ppapi with gin

content/renderer/pepper/pepper_plugin_instance_impl.h

Index: content/renderer/pepper/pepper_plugin_instance_impl.h
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.h b/content/renderer/pepper/pepper_plugin_instance_impl.h
index 4b86e6e67c2eb6af8a76fbc077e6ba8be9674188..6ef11c2e3ed42d0ccfef2e3e632454320638394a 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.h
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.h
@@ -23,6 +23,7 @@
 #include "content/public/renderer/pepper_plugin_instance.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "content/renderer/mouse_lock_dispatcher.h"
+#include "gin/handle.h"
 #include "ppapi/c/dev/pp_cursor_type_dev.h"
 #include "ppapi/c/dev/ppp_printing_dev.h"
 #include "ppapi/c/dev/ppp_selection_dev.h"
@@ -131,7 +132,6 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
                                           const GURL& plugin_url);
   RenderFrameImpl* render_frame() const { return render_frame_; }
   PluginModule* module() const { return module_.get(); }
-  MessageChannel& message_channel() { return *message_channel_; }
 
   blink::WebPluginContainer* container() const { return container_; }
 
@@ -143,6 +143,12 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
     return *resource_creation_.get();
   }
 
+  MessageChannel* message_channel() { return message_channel_; }
+  v8::Local<v8::Object> GetMessageChannelObject();
+  // Called when |message_channel_| is destroyed as it may be destroyed prior to
+  // the plugin being destroyed.
+  void MessageChannelDestroyed();
+
   // Return the v8 context that the plugin is in.
   v8::Local<v8::Context> GetContext();
 
@@ -189,7 +195,7 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
   bool HandleDocumentLoad(const blink::WebURLResponse& response);
   bool HandleInputEvent(const blink::WebInputEvent& event,
                         blink::WebCursorInfo* cursor_info);
-  PP_Var GetInstanceObject();
+  PP_Var GetInstanceObject(v8::Isolate* isolate);
   void ViewChanged(const gfx::Rect& position,
                    const gfx::Rect& clip,
                    const std::vector<gfx::Rect>& cut_outs_rects);
@@ -518,10 +524,6 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
   // the given module.
   bool IsValidInstanceOf(PluginModule* module);
 
-  // Returns the plugin NPP identifier that this plugin will use to identify
-  // itself when making NPObject scripting calls to WebBindings.
-  struct _NPP* instanceNPP();
-
   // cc::TextureLayerClient implementation.
   virtual bool PrepareTextureMailbox(
       cc::TextureMailbox* mailbox,
@@ -830,7 +832,11 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
 
   // The MessageChannel used to implement bidirectional postMessage for the
   // instance.
-  scoped_ptr<MessageChannel> message_channel_;
+  v8::Persistent<v8::Object> message_channel_object_;
+
+  // A pointer to the MessageChannel underlying |message_channel_object_|. It is
+  // only valid as long as |message_channel_object_| is alive.
+  MessageChannel* message_channel_;
 
   // Bitmap for crashed plugin. Lazily initialized, non-owning pointer.
   SkBitmap* sad_plugin_;
@@ -880,10 +886,6 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
   // The link currently under the cursor.
   base::string16 link_under_cursor_;
 
-  // Dummy NPP value used when calling in to WebBindings, to allow the bindings
-  // to correctly track NPObjects belonging to this plugin instance.
-  scoped_ptr<struct _NPP> npp_;
-
   // We store the isolate at construction so that we can be sure to use the
   // Isolate in which this Instance was created when interacting with v8.
   v8::Isolate* isolate_;