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

Revert of [Telemetry] Disable a Dromaeo benchmark on XP due to OOM. (https://codereview.chromium.org/271583003/)

Reason for revert:
The issue is probably fixed by Blink r176006.

Original issue's description:
> [Telemetry] Disable a Dromaeo benchmark on XP due to OOM.
> 
> BUG=323782
> NOTRY=True
> TBR=dtu@chromium.org
> NOTREECHECKS=True
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=268666

NOTRY=true
BUG=323782
TBR=tonyg

Review URL: https://codereview.chromium.org/407023002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284583 0039d316-1c4b-4281-b951-d872f2087c98

tools/perf/benchmarks/dromaeo.py

@@ -118,7 +118,6 @@ class DromaeoDomCoreAttr(_DromaeoBenchmark):
   query_param = 'dom-attr'
 
 
-@benchmark.Disabled('xp')  # crbug.com/323782
 class DromaeoDomCoreModify(_DromaeoBenchmark):
   """Dromaeo DOMCore modify JavaScript benchmark."""
   tag = 'domcoremodify'