Remove OutOfProcessQuarantine entry from the field trial testing config.

The server-side config shows that this study has ended.

Bug: 1126640
Change-Id: If7139fb3de3a5978dcf86c0f74badae7b990d26e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631434Reviewed-by: Patrick Monette <pmonette@chromium.org>
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#844909}

testing/variations/fieldtrial_testing_config.json

@@ -4757,21 +4757,6 @@
             ]
         }
     ],
-    "OutOfProcessQuarantine": [
-        {
-            "platforms": [
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "OutOfProcessQuarantine"
-                    ]
-                }
-            ]
-        }
-    ],
     "OverlayPrioritizationTesting": [
         {
             "platforms": [