Re-enable dromaeo.jslibeventprototype after v8 fix

BUG=476592
TBR=sullivan@chromium.org

Review URL: https://codereview.chromium.org/1089843003

Cr-Commit-Position: refs/heads/master@{#325523}

tools/perf/benchmarks/dromaeo.py

@@ -212,7 +212,6 @@ class DromaeoJslibEventJquery(_DromaeoBenchmark):
     return 'dromaeo.jslibeventjquery'
 
 
-@benchmark.Disabled('android', 'linux')  # http://crbug.com/476592
 class DromaeoJslibEventPrototype(_DromaeoBenchmark):
   """Dromaeo JSLib event prototype JavaScript benchmark.