Update Throttle delayble field trial experiment params and group name

Bug: 753416
Change-Id: If99e2fd12cec42eb3c6a6d464df98f67177ba746
Reviewed-on: https://chromium-review.googlesource.com/1142139Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576147}

testing/variations/fieldtrial_testing_config.json

@@ -4150,10 +4150,10 @@
             ],
             "experiments": [
                 {
-                    "name": "Enabled",
+                    "name": "MaxDelayable_v1_3g_15_Weight3",
                     "params": {
                         "EffectiveConnectionType1": "3G",
-                        "MaxDelayableRequests1": "14",
+                        "MaxDelayableRequests1": "15",
                         "NonDelayableWeight1": "3.0"
                     },
                     "enable_features": [