Remove "delay_tcp_race": "true" from QUIC testing variations since it is now on by default and not …

testing/variations/fieldtrial_testing_config_android.json

 {
     "AllBookmarks": [
         {
             "disable_features": [
                 "AllBookmarks"
             ],
             "group_name": "Disabled"
         }
     ],
     "AndroidSessionNotifications": [
@@ skipping 376 matching lines @@
     "ProgressBarAnimationAndroid": [
         {
             "group_name": "SmoothAnimation",
             "params": {
                 "progress-bar-animation": "smooth"
             }
         }
     ],
     "QUIC": [
         {
-            "group_name": "Enabled",
-            "params": {
-                "delay_tcp_race": "true"
-            }
+            "group_name": "Enabled"
         }
     ],
     "RafAlignedInput": [
         {
             "enable_features": [
                 "RafAlignedInput"
             ],
             "group_name": "Enabled"
         }
     ],
@@ skipping 253 matching lines @@
     ],
     "use-new-media-cache": [
         {
             "enable_features": [
                 "use-new-media-cache"
             ],
             "group_name": "Enabled"
         }
     ]
 }