Remove Autofill Profile Validation entry from the testing config.

The study ended about five months ago. Filed crbug.com/1166263 for
cleaning up the associated features.

Bug: 1126640, 1166263
Change-Id: I9967fb96858460da5ce02e894176b0118b3165af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627092Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#843252}

testing/variations/fieldtrial_testing_config.json

@@ -1001,46 +1001,6 @@
             ]
         }
     ],
-    "AutofillProfileValidation": [
-        {
-            "platforms": [
-                "android",
-                "android_weblayer",
-                "chromeos",
-                "ios",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "EnabledClient_20190211",
-                    "enable_features": [
-                        "AutofillProfileClientValidation"
-                    ],
-                    "disable_features": [
-                        "AutofillProfileServerValidation"
-                    ]
-                },
-                {
-                    "name": "EnabledClientServer_20190211",
-                    "enable_features": [
-                        "AutofillProfileClientValidation",
-                        "AutofillProfileServerValidation"
-                    ]
-                },
-                {
-                    "name": "EnabledServer_20190211",
-                    "enable_features": [
-                        "AutofillProfileServerValidation"
-                    ],
-                    "disable_features": [
-                        "AutofillProfileClientValidation "
-                    ]
-                }
-            ]
-        }
-    ],
     "AutofillPruneSuggestions": [
         {
             "platforms": [