[Telemetry] Update all WPR json files to the new format.

tools/perf/page_sets/data/simple_mobile_sites.json

Index: tools/perf/page_sets/data/simple_mobile_sites.json
diff --git a/tools/perf/page_sets/data/simple_mobile_sites.json b/tools/perf/page_sets/data/simple_mobile_sites.json
index 65a188e946e745c0b0fd8e62c753febb0ad3bed8..529e3bf8ce627fe3f4162cd33c565e94f9a7a77d 100644
--- a/tools/perf/page_sets/data/simple_mobile_sites.json
+++ b/tools/perf/page_sets/data/simple_mobile_sites.json
@@ -1,14 +1,27 @@
 {
-    "description": "Describes the Web Page Replay archives for a page set. Don't edit by hand! Use record_wpr for updating.", 
     "archives": {
-        "simple_mobile_sites_002.wpr": [
-            "http://www.ebay.co.uk/", 
-            "https://www.flickr.com/", 
-            "http://www.apple.com/mac/", 
-            "http://www.nyc.gov", 
-            "http://m.nytimes.com/", 
-            "https://www.yahoo.com/", 
-            "http://m.us.wsj.com/"
-        ]
-    }
-}
+        "http://m.nytimes.com/": {
+            "DEFAULT": "simple_mobile_sites_002.wpr"
+        },
+        "http://m.us.wsj.com/": {
+            "DEFAULT": "simple_mobile_sites_002.wpr"
+        },
+        "http://www.apple.com/mac/": {
+            "DEFAULT": "simple_mobile_sites_002.wpr"
+        },
+        "http://www.ebay.co.uk/": {
+            "DEFAULT": "simple_mobile_sites_002.wpr"
+        },
+        "http://www.nyc.gov": {
+            "DEFAULT": "simple_mobile_sites_002.wpr"
+        },
+        "https://www.flickr.com/": {
+            "DEFAULT": "simple_mobile_sites_002.wpr"
+        },
+        "https://www.yahoo.com/": {
+            "DEFAULT": "simple_mobile_sites_002.wpr"
+        }
+    },
+    "description": "Describes the Web Page Replay archives for a story set. Don't edit by hand! Use record_wpr for updating.",
+    "platform_specific": true
+}