Actually free plugin implement vars when running out of process when the

ppapi/shared_impl/var_tracker.h

Index: ppapi/shared_impl/var_tracker.h
===================================================================
--- ppapi/shared_impl/var_tracker.h	(revision 141525)
+++ ppapi/shared_impl/var_tracker.h	(working copy)
@@ -11,6 +11,7 @@
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/non_thread_safe.h"
+#include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
@@ -33,7 +34,7 @@
 // anything with it other than call virtual functions. The interesting parts
 // are added by the PluginObjectVar derived from this class.
 class PPAPI_SHARED_EXPORT VarTracker
-#ifdef ENABLE_PEPPER_THREADING
+#if 1//def ENABLE_PEPPER_THREADING

[viettrungluu, 2012/06/15 21:55:52]

wtf?

     : NON_EXPORTED_BASE(public base::NonThreadSafeDoNothing) {
 #else
     // TODO(dmichael): Remove the thread checking when calls are allowed off the
@@ -84,6 +85,9 @@
   int GetRefCountForObject(const PP_Var& object);
   int GetTrackedWithNoReferenceCountForObject(const PP_Var& object);
 
+  // Called after an instance is deleted to do var cleanup.
+  virtual void DidDeleteInstance(PP_Instance instance) = 0;
+
  protected:
   struct VarInfo {
     VarInfo();