Using multi-tab story in TabSwitching Benchmark

tools/perf/benchmarks/tab_switching.py

Index: tools/perf/benchmarks/tab_switching.py
diff --git a/tools/perf/benchmarks/tab_switching.py b/tools/perf/benchmarks/tab_switching.py
index 6962989cf54d46ac905afbc4b47f433169d80dff..18102df6a89eaf89f460c9d8e5b55dc787a5978f 100644
--- a/tools/perf/benchmarks/tab_switching.py
+++ b/tools/perf/benchmarks/tab_switching.py
@@ -43,10 +43,11 @@ class TabSwitchingTypical25(perf_benchmark.PerfBenchmark):
   tabs, waits for them to load, and then switches to each tab and records the
   metric. The pages were chosen from Alexa top ranking sites.
   """
-  test = tab_switching.TabSwitching
+  test = tab_switching.TabSwitching2
 
   def CreateStorySet(self, options):
-    return page_sets.Typical25PageSet(run_no_page_interactions=True)
+    return page_sets.SystemHealthStorySet(platform='desktop',
+                                          case='multitab:misc')
 
   @classmethod
   def Name(cls):