Unify var tracking between webkit and the proxy.

ppapi/proxy/plugin_resource_tracker.cc

Index: ppapi/proxy/plugin_resource_tracker.cc
===================================================================
--- ppapi/proxy/plugin_resource_tracker.cc	(revision 96002)
+++ ppapi/proxy/plugin_resource_tracker.cc	(working copy)
@@ -148,34 +148,10 @@
   return found->second.resource->instance();
 }
 
-int32 PluginResourceTracker::AddVar(ppapi::Var* var) {
-  // TODO(brettw) implement this when the proxy uses the Var object in the
-  // plugin process.
-  NOTREACHED();
-  return 0;
+ppapi::VarTracker* PluginResourceTracker::GetVarTracker() {
+  return &var_tracker();
 }
 
-scoped_refptr<ppapi::Var> PluginResourceTracker::GetVar(int32 var_id) const {
-  // TODO(brettw) implement this when the proxy uses the Var object in the
-  // plugin process.
-  NOTREACHED();
-  return scoped_refptr<ppapi::Var>();
-}
-
-bool PluginResourceTracker::AddRefVar(int32 var_id) {
-  // TODO(brettw) implement this when the proxy uses the Var object in the
-  // plugin process.
-  NOTREACHED();
-  return false;
-}
-
-bool PluginResourceTracker::UnrefVar(int32 var_id) {
-  // TODO(brettw) implement this when the proxy uses the Var object in the
-  // plugin process.
-  NOTREACHED();
-  return false;
-}
-
 void PluginResourceTracker::ReleasePluginResourceRef(
     const PP_Resource& resource,
     bool notify_browser_on_release) {