fix the comment

src/butil/resource_pool.h

@@ -75,7 +75,7 @@ template <typename T> struct ResourcePoolFreeChunkMaxItem {
 
 // ResourcePool calls this function on newly constructed objects. If this
 // function returns false, the object is destructed immediately and
-// get_object() shall return NULL. This is useful when the constructor
+// get_resource() shall return NULL. This is useful when the constructor
 // failed internally(namely ENOMEM).
 template <typename T> struct ResourcePoolValidator {
     static bool validate(const T*) { return true; }