Enable "AdvancedProtectionStatus" feature in tests

Add experiment to fieldtrial_testing_config that enables
AdvancedProtectionStatus feature by default in tests.

Bug: 866620
Change-Id: Ia8a85921b5cd5ee52ee49af3590ef36770fabe71
Reviewed-on: https://chromium-review.googlesource.com/1217349Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590122}

testing/variations/fieldtrial_testing_config.json

@@ -57,6 +57,24 @@
             ]
         }
     ],
+    "AdvancedProtectionStatus": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "AdvancedProtectionStatus"
+                    ]
+                }
+            ]
+        }
+    ],
     "AllowClientHintsToThirdParty": [
         {
             "platforms": [