Move the tracked completion callback code into shared impl.

ppapi/shared_impl/resource_tracker.cc

Index: ppapi/shared_impl/resource_tracker.cc
===================================================================
--- ppapi/shared_impl/resource_tracker.cc	(revision 115831)
+++ ppapi/shared_impl/resource_tracker.cc	(working copy)
@@ -4,7 +4,9 @@
 
 #include "ppapi/shared_impl/resource_tracker.h"
 
+#include "ppapi/shared_impl/callback_tracker.h"
 #include "ppapi/shared_impl/id_assignment.h"
+#include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/resource.h"
 
 namespace ppapi {
@@ -168,6 +170,8 @@
 }
 
 void ResourceTracker::LastPluginRefWasDeleted(Resource* object) {
+  PpapiGlobals::Get()->GetCallbackTrackerForInstance(object->pp_instance())->
+      PostAbortForResource(object->pp_resource());
   object->LastPluginRefWasDeleted();
 }