Revert "Add test coverage of field trial for Certificate Transparency log auditing"

This reverts commit 885175c6.

Reason for revert: https://crbug.com/811566

Original change's description:
> Add test coverage of field trial for Certificate Transparency log auditing
> 
> It is intended that this feature will be slowly turned on in the near
> future. Only desktop platforms will be enabled initially.
> 
> Bug: 506227
> Change-Id: Ie6669f1ecb07c84ee26f28349b30f3da5b5cbf8f
> Reviewed-on: https://chromium-review.googlesource.com/873531
> Reviewed-by: Jesse Doherty <jwd@chromium.org>
> Commit-Queue: Rob Percival <robpercival@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#536100}

TBR=rsleevi@chromium.org,jwd@chromium.org,robpercival@chromium.org,sdoyon@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 506227
Change-Id: I46afc0c9ff42d5cd840e02e3982a92079fd60ce5
Reviewed-on: https://chromium-review.googlesource.com/918582Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Commit-Queue: Rob Percival <robpercival@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536725}

testing/variations/fieldtrial_testing_config.json

@@ -773,24 +773,6 @@
             ]
         }
     ],
-    "CertificateTransparencyLogAuditing": [
-        {
-            "platforms": [
-                "chromeos",
-                "linux",
-                "mac",
-                "win"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "CertificateTransparencyLogAuditing"
-                    ]
-                }
-            ]
-        }
-    ],
     "CheckerImaging": [
         {
             "platforms": [