Revert "Add CriticlaPersistedTabData to fieldtrial_testing_config"

This reverts commit 56334b9e.

Reason for revert: causing a bot to crash see crbug.com/1148972

Original change's description:
> Add CriticlaPersistedTabData to fieldtrial_testing_config
>
> This was determined to be necessary in cl/342061697
>
> Bug: 1148823
> Change-Id: I125e177fa057e6aebd92a0750559e4a68940c312
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537699
> Reviewed-by: Mark Pearson <mpearson@chromium.org>
> Commit-Queue: David Maunder <davidjm@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#827346}

TBR=mpearson@chromium.org,davidjm@chromium.org

Change-Id: I7238b95d7e0577f6d5797fe500a3031d5e7f5960
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1148823
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537003Reviewed-by: David Maunder <davidjm@chromium.org>
Commit-Queue: David Maunder <davidjm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827466}

testing/variations/fieldtrial_testing_config.json

@@ -1932,21 +1932,6 @@
             ]
         }
     ],
-    "CriticalPersistedTabData": [
-        {
-            "platforms": [
-                "android"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "CriticalPersistedTabData"
-                    ]
-                }
-            ]
-        }
-    ],
     "CrosSchedulerCore": [
         {
             "platforms": [