Add ThrottleDelayable 4G params to fieldtrial_testing_config.json

Bug: 746640
Change-Id: Ie312a7756f5e6917a4d7c2bd107951f4928e97d0
Reviewed-on: https://chromium-review.googlesource.com/1024054Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552765}

testing/variations/fieldtrial_testing_config.json

@@ -3644,8 +3644,11 @@
                     "name": "Enabled",
                     "params": {
                         "EffectiveConnectionType1": "3G",
+                        "EffectiveConnectionType2": "4G",
                         "MaxDelayableRequests1": "14",
-                        "NonDelayableWeight1": "2.0"
+                        "MaxDelayableRequests2": "18",
+                        "NonDelayableWeight1": "3.0",
+                        "NonDelayableWeight2": "3.0"
                     },
                     "enable_features": [
                         "ThrottleDelayable"