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

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284583

[kouhei (in TOK), 2014-07-22 00:05:50]

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

[kouhei (in TOK), 2014-07-22 00:06:25]

The CQ bit was checked by kouhei@chromium.org

[commit-bot: I haz the power, 2014-07-22 00:09:50]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/kouhei@chromium.org/407023002/1

[commit-bot: I haz the power, 2014-07-22 00:56:03]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-07-22 00:56:04]

Failed to apply patch for tools/perf/benchmarks/dromaeo.py:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file tools/perf/benchmarks/dromaeo.py
  Hunk #1 FAILED at 74.
  1 out of 1 hunk FAILED -- saving rejects to file
tools/perf/benchmarks/dromaeo.py.rej

Patch:       tools/perf/benchmarks/dromaeo.py
Index: tools/perf/benchmarks/dromaeo.py
diff --git a/tools/perf/benchmarks/dromaeo.py b/tools/perf/benchmarks/dromaeo.py
index
eb47892e2095c7c63de794136293f1ae54b983a6..f3f11d10e46f7c050b998ba04256e81156189eb3
100644
--- a/tools/perf/benchmarks/dromaeo.py
+++ b/tools/perf/benchmarks/dromaeo.py
@@ -74,7 +74,6 @@
   query_param = 'dom-attr'
 
 
-@test.Disabled('xp')  # crbug.com/323782
 class DromaeoDomCoreModify(_DromaeoBenchmark):
   """Dromaeo DOMCore modify JavaScript benchmark."""
   tag = 'domcoremodify'

[kouhei (in TOK), 2014-07-22 01:01:44]

The CQ bit was checked by kouhei@chromium.org

[commit-bot: I haz the power, 2014-07-22 01:05:18]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/kouhei@chromium.org/407023002/40001

[commit-bot: I haz the power, 2014-07-22 01:33:52]

Change committed as 284583