Remove Pepper URLLoader from resource tracker early.

ppapi/shared_impl/resource.h

Index: ppapi/shared_impl/resource.h
diff --git a/ppapi/shared_impl/resource.h b/ppapi/shared_impl/resource.h
index ddfdcfbfd7de98c7ebc5ccbcaa15adf08ec577b4..7fffd4af210ad559961f7a310107be33bb056969 100644
--- a/ppapi/shared_impl/resource.h
+++ b/ppapi/shared_impl/resource.h
@@ -208,6 +208,14 @@ class PPAPI_SHARED_EXPORT Resource : public base::RefCounted<Resource> {
   // Logs a message to the console from this resource.
   void Log(PP_LogLevel level, const std::string& message);
 
+  // Removes the resource from the ResourceTracker's tables. This normally
+  // happens as part of Resource destruction, but if a subclass destructor
+  // has a risk of re-entering destruction via the ResourceTracker, it can
+  // call this explicitly to get rid of the table entry before continuing
+  // with the destruction. If the resource is not in the ResourceTracker's
+  // tables, silently does nothing. See http://crbug.com/159429.
+  void RemoveFromResourceTracker();
+
   // Notifications for subclasses.
   virtual void LastPluginRefWasDeleted() {}
   virtual void InstanceWasDeleted() {}