Remove "delay_tcp_race": "true" from QUIC testing variations since it is now...

Remove "delay_tcp_race": "true" from QUIC testing variations since it is now on by default and not enabled in the finch configs.

Review-Url: https://codereview.chromium.org/2348033002
Cr-Commit-Position: refs/heads/master@{#419499}

testing/variations/fieldtrial_testing_config_android.json

@@ -394,10 +394,7 @@
     ],
     "QUIC": [
         {
-            "group_name": "Enabled",
-            "params": {
-                "delay_tcp_race": "true"
-            }
+            "group_name": "Enabled"
         }
     ],
     "RafAlignedInput": [

testing/variations/fieldtrial_testing_config_chromeos.json

@@ -220,10 +220,7 @@
     ],
     "QUIC": [
         {
-            "group_name": "Enabled",
-            "params": {
-                "delay_tcp_race": "true"
-            }
+            "group_name": "Enabled"
         }
     ],
     "RafAlignedInput": [

testing/variations/fieldtrial_testing_config_ios.json

@@ -89,10 +89,7 @@
     ],
     "QUIC": [
         {
-            "group_name": "Enabled",
-            "params": {
-                "delay_tcp_race": "true"
-            }
+            "group_name": "Enabled"
         }
     ],
     "SdchPersistence": [

testing/variations/fieldtrial_testing_config_linux.json

@@ -268,10 +268,7 @@
     ],
     "QUIC": [
         {
-            "group_name": "Enabled",
-            "params": {
-                "delay_tcp_race": "true"
-            }
+            "group_name": "Enabled"
         }
     ],
     "RafAlignedInput": [

testing/variations/fieldtrial_testing_config_mac.json

@@ -304,10 +304,7 @@
     ],
     "QUIC": [
         {
-            "group_name": "Enabled",
-            "params": {
-                "delay_tcp_race": "true"
-            }
+            "group_name": "Enabled"
         }
     ],
     "RafAlignedInput": [

testing/variations/fieldtrial_testing_config_win.json

@@ -375,10 +375,7 @@
     ],
     "QUIC": [
         {
-            "group_name": "Enabled",
-            "params": {
-                "delay_tcp_race": "true"
-            }
+            "group_name": "Enabled"
         }
     ],
     "RafAlignedInput": [