Enable SafeBrowsingRealTimeUrlLookupEnabled on bots.

R=holte

Bug: 963165
Change-Id: Iad7981b06d2541623bf58d0db98c314ed9f4ec30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898749
Commit-Queue: Varun Khaneja <vakh@chromium.org>
Auto-Submit: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713226}

testing/variations/fieldtrial_testing_config.json

@@ -5300,6 +5300,24 @@
             ]
         }
     ],
+    "SafeBrowsingRealTimeUrlLookupEnabled": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "SafeBrowsingRealTimeUrlLookupEnabled"
+                    ]
+                }
+            ]
+        }
+    ],
     "SafeBrowsingRealTimeUrlLookupFetchAllowlist": [
         {
             "platforms": [