Add CertVerifierService to field trial testing config.

Turn the CertVerifierService on by default in non-Chrome branded builds
for desktop platforms.

Bug: 1015134, 1094483
Change-Id: I853155582dde092c39ab1975a0b8081eed994600
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324643
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793803}

testing/variations/fieldtrial_testing_config.json

@@ -1444,6 +1444,24 @@
             ]
         }
     ],
+    "CertVerifierService": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "CertVerifierService"
+                    ]
+                }
+            ]
+        }
+    ],
     "ChromeCleanupDistribution": [
         {
             "platforms": [