Remove WebRTC-Audio-NetEqDelayHistogram entry from testing config.

Bug: 1126640
Change-Id: I1d7d54d8999d526fc65ec54dcec4f8d15a5f03ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626419
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844898}

testing/variations/fieldtrial_testing_config.json

@@ -7383,21 +7383,6 @@
             ]
         }
     ],
-    "WebRTC-Audio-NetEqDelayHistogram": [
-        {
-            "platforms": [
-                "windows",
-                "mac",
-                "chromeos",
-                "linux"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled-95-0.9993"
-                }
-            ]
-        }
-    ],
     "WebRTC-Audio-NetEqDelayManagerConfig": [
         {
             "platforms": [