Add Multi-tab System Health Story

tools/perf/page_sets/data/system_health_desktop.json

Index: tools/perf/page_sets/data/system_health_desktop.json
diff --git a/tools/perf/page_sets/data/system_health_desktop.json b/tools/perf/page_sets/data/system_health_desktop.json
index a542d446740357e9717fa16cfabb0763ba0db5ab..c83df9d8b3a7a883b9770424d28cf5fe86f76c28 100644
--- a/tools/perf/page_sets/data/system_health_desktop.json
+++ b/tools/perf/page_sets/data/system_health_desktop.json
@@ -172,7 +172,7 @@
             "DEFAULT": "system_health_desktop_028.wpr"
         },
         "multitab:misc:typical24": {
-            "DEFAULT": "system_health_desktop_048.wpr"
+            "DEFAULT": "system_health_desktop_049.wpr"
         },
         "play:media:google_play_music": {
             "DEFAULT": "system_health_desktop_030.wpr"
@@ -189,4 +189,4 @@
     },
     "description": "Describes the Web Page Replay archives for a story set. Don't edit by hand! Use record_wpr for updating.",
     "platform_specific": true
-}
+}