Enable faster reload on variation testing

This patch removes NonValidatingReloadOnRefreshContent entry that was
already replaced with V2, and adds NonValidatingReloadOnNormalReload as
I did for desktops before.

BUG=591245

Review-Url: https://codereview.chromium.org/2344503002
Cr-Commit-Position: refs/heads/master@{#418784}

testing/variations/fieldtrial_testing_config_android.json

@@ -263,10 +263,10 @@
             "group_name": "Enabled"
         }
     ],
-    "NonValidatingReloadOnRefreshContent": [
+    "NonValidatingReloadOnNormalReload": [
         {
             "enable_features": [
-                "NonValidatingReloadOnRefreshContent"
+                "NonValidatingReloadOnNormalReload"
             ],
             "group_name": "Enabled"
         }