Unify var tracking between webkit and the proxy.

webkit/plugins/ppapi/ppapi_plugin_instance.cc

Index: webkit/plugins/ppapi/ppapi_plugin_instance.cc
===================================================================
--- webkit/plugins/ppapi/ppapi_plugin_instance.cc	(revision 95769)
+++ webkit/plugins/ppapi/ppapi_plugin_instance.cc	(working copy)
@@ -609,7 +609,8 @@
   PP_Var rv = plugin_selection_interface_->GetSelectedText(pp_instance(),
                                                            PP_FromBool(html));
   scoped_refptr<StringVar> string(StringVar::FromPPVar(rv));
-  Var::PluginReleasePPVar(rv);  // Release the ref the plugin transfered to us.
+  // Release the ref the plugin transfered to us.
+  ResourceTracker::Get()->GetVarTracker()->ReleaseVar(rv);
   if (!string)
     return string16();
   return UTF8ToUTF16(string->value());
@@ -626,7 +627,8 @@
   p.y = point.y();
   PP_Var rv = plugin_pdf_interface_->GetLinkAtPosition(pp_instance(), p);
   scoped_refptr<StringVar> string(StringVar::FromPPVar(rv));
-  Var::PluginReleasePPVar(rv);  // Release the ref the plugin transfered to us.
+  // Release the ref the plugin transfered to us.
+  ResourceTracker::Get()->GetVarTracker()->ReleaseVar(rv);
   if (!string)
     return string16();
   return UTF8ToUTF16(string->value());