Add Windows-specific WPR archives for YouTube system health stories

tools/perf/page_sets/data/system_health_desktop.json

 {
     "archives": {
         "browse:media:imgur": {
             "DEFAULT": "system_health_desktop_025.wpr"
         },
         "browse:media:pinterest": {
             "DEFAULT": "system_health_desktop_035.wpr"
         },
         "browse:media:tumblr": {
             "DEFAULT": "system_health_desktop_036.wpr"
         },
         "browse:media:youtube": {
             "DEFAULT": "system_health_desktop_026.wpr",
             "linux": "system_health_desktop_026.wpr",
-            "mac": "system_health_desktop_040.wpr"
+            "mac": "system_health_desktop_040.wpr",
+            "win": "system_health_desktop_041.wpr"
         },
         "browse:news:cnn": {
             "DEFAULT": "system_health_desktop_013.wpr"
         },
         "browse:news:flipboard": {
             "DEFAULT": "system_health_desktop_021.wpr"
         },
         "browse:news:hackernews": {
             "DEFAULT": "system_health_desktop_014.wpr"
         },
@@ skipping 41 matching lines @@
         },
         "load:media:imgur": {
             "DEFAULT": "system_health_desktop_025.wpr"
         },
         "load:media:soundcloud": {
             "DEFAULT": "system_health_desktop_003.wpr"
         },
         "load:media:youtube": {
             "DEFAULT": "system_health_desktop_003.wpr",
             "linux": "system_health_desktop_003.wpr",
-            "mac": "system_health_desktop_040.wpr"
+            "mac": "system_health_desktop_040.wpr",
+            "win": "system_health_desktop_044.wpr"

[rnephew (Reviews Here), 2017/02/23 16:31:57]

Sorry for so many separate comments, but why does it jump from 41 to 44?

         },
         "load:news:bbc": {
             "DEFAULT": "system_health_desktop_002.wpr"
         },
         "load:news:cnn": {
             "DEFAULT": "system_health_desktop_006.wpr"
         },
         "load:news:flipboard": {
             "DEFAULT": "system_health_desktop_020.wpr"
         },
@@ skipping 90 matching lines @@
         "play:media:soundcloud": {
             "DEFAULT": "system_health_desktop_030.wpr"
         },
         "search:portal:google": {
             "DEFAULT": "system_health_desktop_022.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
 }