Remove EnableSafetyTipUI entry from the testing config.

Bug: 1126640, 1166281
Change-Id: I40b983f90e542f84ce112491a01a58bce69decf3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626179
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Joe DeBlasio <jdeblasio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843236}

testing/variations/fieldtrial_testing_config.json

@@ -3030,31 +3030,6 @@
             ]
         }
     ],
-    "EnableSafetyTipUI": [
-        {
-            "platforms": [
-                "android",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "UIEnabled",
-                    "params": {
-                        "editdistance": "false",
-                        "editdistance_siteengagement": "true",
-                        "targetembedding": "false",
-                        "topsites": "true"
-                    },
-                    "enable_features": [
-                        "SafetyTip"
-                    ]
-                }
-            ]
-        }
-    ],
     "EnableSuggestedFiles": [
         {
             "platforms": [