[tools/perf] Remove trace rerun options from dual browser benchmark

tools/perf/benchmarks/memory_infra.py

Index: tools/perf/benchmarks/memory_infra.py
diff --git a/tools/perf/benchmarks/memory_infra.py b/tools/perf/benchmarks/memory_infra.py
index 1c89590bd8fa98ac2d99fb8871fecaf56eaee430..ed58f3303c0578d64993c3599fe9191635136872 100644
--- a/tools/perf/benchmarks/memory_infra.py
+++ b/tools/perf/benchmarks/memory_infra.py
@@ -111,6 +111,7 @@ class DualBrowserBenchmark(_MemoryInfra):
   on a webview-based browser (a stand in for the Search app), and loading
   pages on a select browser.
   """
+  TBM_VERSION = 2
   page_set = page_sets.DualBrowserStorySet
   options = {'pageset_repeat': 5}
 
@@ -118,10 +119,6 @@ class DualBrowserBenchmark(_MemoryInfra):
   def Name(cls):
     return 'memory.dual_browser_test'
 
-  def SetupBenchmarkDefaultTraceRerunOptions(self, tbm_options):
-    # This is a TBMv2 benchmark.
-    tbm_options.SetTimelineBasedMetric('memoryMetric')
-
 
 # TODO(bashi): Workaround for http://crbug.com/532075
 # @benchmark.Enabled('android') shouldn't be needed.