Reenable smoothness top_25 benchmarks on reference build.

tools/perf/benchmarks/smoothness.py

Index: tools/perf/benchmarks/smoothness.py
diff --git a/tools/perf/benchmarks/smoothness.py b/tools/perf/benchmarks/smoothness.py
index be9c195f0350bbee163c233ea12aee95da8a094a..b856bb9fedd6756519ca66b126e02fca22e889bc 100644
--- a/tools/perf/benchmarks/smoothness.py
+++ b/tools/perf/benchmarks/smoothness.py
@@ -37,7 +37,6 @@ class _Smoothness(perf_benchmark.PerfBenchmark):
     return True
 
 
-@benchmark.Disabled('reference') # crbug.com/547833
 class SmoothnessTop25(_Smoothness):
   """Measures rendering statistics while scrolling down the top 25 web pages.
 
@@ -158,7 +157,6 @@ class SmoothnessKeySilkCases(_Smoothness):
 
 
 @benchmark.Enabled('android', 'mac')
-@benchmark.Disabled('reference') # crbug.com/547833
 class SmoothnessGpuRasterizationTop25(_Smoothness):
   """Measures rendering statistics for the top 25 with GPU rasterization.
   """