Code:  PP_Resource ResourceTracker::AddResource(Resource* resource) {
   if (last_resource_id_ ==
      (std::numeric_limits<PP_Resource>::max() >> kPPIdTypeBits))
    return 0;

  PP_Resource new_id = MakeTypedId(++last_resource_id_, PP_ID_TYPE_RESOURCE);
  live_resources_.insert(std::make_pair(new_id, std::make_pair(resource, 1)));

   PP_Instance pp_instance = resource->instance()->pp_instance();
   DCHECK(instance_map_.find(pp_instance) != instance_map_.end());
  instance_map_[pp_instance]->resources.insert(new_id);
   return new_id;
 }

Vulnerability Type: DoS 
CWE ID: CWE-399
Summary: Use-after-free vulnerability in Google Chrome before 13.0.782.107 allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors related to instantiation of the Pepper plug-in.
Commit Message: Maintain a map of all resources in the resource tracker and clear instance back pointers when needed,

BUG=85808
Review URL: http://codereview.chromium.org/7196001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89746 0039d316-1c4b-4281-b951-d872f2087c98