Fetch: Remove BufferingBytesConsumerDelay testing config.

This feature was enabled by default in crrev.com/c/1736868.

Bug: 954442
Change-Id: I60b3c34aa1427a4e91230074d326d3ba5fa08d0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1739528
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684378}

testing/variations/fieldtrial_testing_config.json

@@ -1339,28 +1339,6 @@
             ]
         }
     ],
-    "BufferingBytesConsumerDelay": [
-        {
-            "platforms": [
-                "windows",
-                "mac",
-                "chromeos",
-                "linux",
-                "android"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "params": {
-                        "milliseconds": "50"
-                    },
-                    "enable_features": [
-                        "BufferingBytesConsumerDelay"
-                    ]
-                }
-            ]
-        }
-    ],
     "CertDualVerificationTrial": [
         {
             "platforms": [