Revert of [Telemetry] Disable a Dromaeo benchmark on XP due to OOM.

tools/perf/benchmarks/dromaeo.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import math
 import os
 
 from metrics import power
 from telemetry import benchmark
 from telemetry.page import page_measurement
@@ skipping 100 matching lines @@
     ps.AddPageWithDefaultRunNavigate(url)
     return ps
 
 
 class DromaeoDomCoreAttr(_DromaeoBenchmark):
   """Dromaeo DOMCore attr JavaScript benchmark."""
   tag = 'domcoreattr'
   query_param = 'dom-attr'
 
 
-@benchmark.Disabled('xp')  # crbug.com/323782
 class DromaeoDomCoreModify(_DromaeoBenchmark):
   """Dromaeo DOMCore modify JavaScript benchmark."""
   tag = 'domcoremodify'
   query_param = 'dom-modify'
 
 
 class DromaeoDomCoreQuery(_DromaeoBenchmark):
   """Dromaeo DOMCore query JavaScript benchmark."""
   tag = 'domcorequery'
   query_param = 'dom-query'
@@ skipping 64 matching lines @@
   """Dromaeo JSLib traverse prototype JavaScript benchmark"""
   tag = 'jslibtraverseprototype'
   query_param = 'jslib-traverse-prototype'
 
 
 class DromaeoCSSQueryJquery(_DromaeoBenchmark):
   """Dromaeo CSS Query jquery JavaScript benchmark"""
   tag = 'cssqueryjquery'
   query_param = 'cssquery-jquery'