[system-health] Update WPR for browse:social:facebook and browse:news:reddit on mobile

The original archives were recorded on Chrome Public (android-chromium)
and used an encoding that is not yet supported by Chrome Stable
(reference).

BUG=630004
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.perf:android_s5_perf_cq;master.tryserver.chromium.perf:mac_retina_perf_cq

Review-Url: https://codereview.chromium.org/2172263002
Cr-Commit-Position: refs/heads/master@{#407175}

tools/perf/page_sets/data/system_health_mobile.json

@@ -65,9 +65,6 @@
         "system_health_mobile_014.wpr": [
             "browse:news:cnn"
         ],
-        "system_health_mobile_015.wpr": [
-            "browse:social:facebook"
-        ],
         "system_health_mobile_016.wpr": [
             "browse:news:hackernews"
         ],
@@ -77,9 +74,6 @@
         "system_health_mobile_018.wpr": [
             "browse:news:qq"
         ],
-        "system_health_mobile_019.wpr": [
-            "browse:news:reddit"
-        ],
         "system_health_mobile_021.wpr": [
             "browse:news:washingtonpost"
         ],
@@ -94,6 +88,12 @@
         ],
         "system_health_mobile_025.wpr": [
             "browse:news:flipboard"
+        ],
+        "system_health_mobile_026.wpr": [
+            "browse:social:facebook"
+        ],
+        "system_health_mobile_027.wpr": [
+            "browse:news:reddit"
         ]
     },
     "description": "Describes the Web Page Replay archives for a story set. Don't edit by hand! Use record_wpr for updating."

tools/perf/page_sets/data/system_health_mobile_026.wpr.sha1

+06c515c82c7f750766b75fef81f1ef2ed9fdc460
\ No newline at end of file

tools/perf/page_sets/data/system_health_mobile_027.wpr.sha1

+67e8d07bce769132a282f93303bd06bad2c5810d
\ No newline at end of file