[system-health] Unify SH stories interface

tools/perf/page_sets/data/browsing_mobile.json

Index: tools/perf/page_sets/data/browsing_mobile.json
diff --git a/tools/perf/page_sets/data/browsing_mobile.json b/tools/perf/page_sets/data/browsing_mobile.json
deleted file mode 100644
index 37b649cd0125f2b62ab5ebd75f2beb3f25d3ee03..0000000000000000000000000000000000000000
--- a/tools/perf/page_sets/data/browsing_mobile.json
+++ /dev/null
@@ -1,29 +0,0 @@
-{
-    "archives": {
-        "browsing_mobile_000.wpr": [
-            "browse:news:cnn"
-        ],
-        "browsing_mobile_001.wpr": [
-            "browse:social:facebook"
-        ],
-        "browsing_mobile_002.wpr": [
-            "browse:news:hackernews"
-        ],
-        "browsing_mobile_003.wpr": [
-            "browse:news:nytimes"
-        ],
-        "browsing_mobile_004.wpr": [
-            "browse:news:qq"
-        ],
-        "browsing_mobile_005.wpr": [
-            "browse:news:reddit"
-        ],
-        "browsing_mobile_006.wpr": [
-            "browse:social:twitter"
-        ],
-        "browsing_mobile_007.wpr": [
-            "browse:news:washingtonpost"
-        ]
-    },
-    "description": "Describes the Web Page Replay archives for a story set. Don't edit by hand! Use record_wpr for updating."
-}