Remove Fence.setReportEventDataForAutomaticBeacons.start_commit_eventType (#27831)

Remove Fence.setReportEventDataForAutomaticBeacons.start_commit_eventType

Author: Elchi3

api/Fence.json

@@ -137,41 +137,6 @@
             "standard_track": true,
             "deprecated": false
           }
-        },
-        "start_commit_eventType": {
-          "__compat": {
-            "description": "Separate `reserved.top_navigation_start` and `reserved.top_navigation_commit` `eventType` values",
-            "tags": [
-              "web-features:fencedframe"
-            ],
-            "support": {
-              "chrome": {
-                "version_added": "126",
-                "notes": "Previously only a single `eventType` was available, `reserved.top_navigation`, but this has been replaced by the new values."
-              },
-              "chrome_android": "mirror",
-              "edge": "mirror",
-              "firefox": {
-                "version_added": false
-              },
-              "firefox_android": "mirror",
-              "oculus": "mirror",
-              "opera": "mirror",
-              "opera_android": "mirror",
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": "mirror",
-              "samsunginternet_android": "mirror",
-              "webview_android": "mirror",
-              "webview_ios": "mirror"
-            },
-            "status": {
-              "experimental": true,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
         }
       }
     }