Convert PepperBrowserConnection to be a RenderFrameObserver.

content/public/renderer/renderer_ppapi_host.h

Index: content/public/renderer/renderer_ppapi_host.h
===================================================================
--- content/public/renderer/renderer_ppapi_host.h	(revision 238258)
+++ content/public/renderer/renderer_ppapi_host.h	(working copy)
@@ -40,6 +40,7 @@
 
 namespace content {
 class PepperPluginInstance;
+class RenderFrame;
 class RenderView;
 
 // Interface that allows components in the embedder app to talk to the
@@ -71,6 +72,11 @@
   virtual PepperPluginInstance* GetPluginInstance(
       PP_Instance instance) const = 0;
 
+  // Returns the RenderFrame for the given plugin instance, or NULL if the
+  // instance is invalid.
+  virtual RenderFrame* GetRenderFrameForInstance(
+      PP_Instance instance) const = 0;
+
   // Returns the RenderView for the given plugin instance, or NULL if the
   // instance is invalid.
   virtual RenderView* GetRenderViewForInstance(PP_Instance instance) const = 0;