[system-health] Generalize loading stories to single-page stories

tools/perf/benchmarks/battor.py

Index: tools/perf/benchmarks/battor.py
diff --git a/tools/perf/benchmarks/battor.py b/tools/perf/benchmarks/battor.py
index faafe489ef469633b5740cb3d6e768ddc027929c..42abbf390984ab8c5c447b5bcb54037f75b8c321 100644
--- a/tools/perf/benchmarks/battor.py
+++ b/tools/perf/benchmarks/battor.py
@@ -55,8 +55,7 @@ class BattOrSystemHealthLoadingDesktop(_BattOrBenchmark):
   """Desktop Chrome Memory System Health Benchmark."""
 
   def CreateStorySet(self, options):
-    return page_sets.DesktopMemorySystemHealthStorySet(
-        take_memory_measurement=False)
+    return page_sets.DesktopSystemHealthStorySet(take_memory_measurement=False)
 
   @classmethod
   def ShouldDisable(cls, possible_browser):
@@ -72,8 +71,7 @@ class BattOrSystemHealthLoadingMobile(_BattOrBenchmark):
   """Mobile Chrome Memory System Health Benchmark."""
 
   def CreateStorySet(self, options):
-    return page_sets.MobileMemorySystemHealthStorySet(
-        take_memory_measurement=False)
+    return page_sets.MobileSystemHealthStorySet(take_memory_measurement=False)
 
   @classmethod
   def ShouldDisable(cls, possible_browser):