Update fieldtrial_testing_config for CSD model

Due to consolidating the two different configs currently applying to
the CSD model version, we need the fieldtrial_testing_config to be kept
in sync.

Change-Id: I1adef41facd0d38d16e562561639ac1f5672ec07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399722Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805804}

testing/variations/fieldtrial_testing_config.json

@@ -1269,6 +1269,35 @@
             ]
         }
     ],
+    "ClientSideDetectionModel": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac"
+            ],
+            "experiments": [
+                {
+                    "name": "EnabledWithVisualModel",
+                    "params": {
+                        "ModelNum": "5"
+                    },
+                    "enable_features": [
+                        "ClientSideDetectionModel"
+                    ]
+                },
+                {
+                    "name": "EnabledDomOnly",
+                    "params": {
+                        "ModelNum": "4"
+                    },
+                    "enable_features": [
+                        "ClientSideDetectionModel"
+                    ]
+                }
+            ]
+        }
+    ],
     "CodeCacheDeletionWithoutFilter": [
         {
             "platforms": [
@@ -7155,27 +7184,6 @@
             ]
         }
     ],
-    "VisualClientSideDetectionModel": [
-        {
-            "platforms": [
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "params": {
-                        "ModelNum": "5"
-                    },
-                    "enable_features": [
-                        "ClientSideDetectionModel"
-                    ]
-                }
-            ]
-        }
-    ],
     "VizForWebView": [
         {
             "platforms": [