Update NetAdaptiveProxyConnectionTimeout for new experiment params

Bug: 704339
Change-Id: Idce639d844d07252c2618ceb34a589964723ccc4
Reviewed-on: https://chromium-review.googlesource.com/891806Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533216}

testing/variations/fieldtrial_testing_config.json

@@ -2137,13 +2137,18 @@
     "NetAdaptiveProxyConnectionTimeout": [
         {
             "platforms": [
-                "android"
+                "android",
+                "chromeos",
+                "linux",
+                "mac",
+                "win"
             ],
             "experiments": [
                 {
-                    "name": "Enabled_1_m5",
+                    "name": "Enabled_Forced",
                     "params": {
-                        "transport_rtt_multiplier": "5"
+                        "non_ssl_http_rtt_multiplier": "6",
+                        "ssl_http_rtt_multiplier": "8"
                     }
                 }
             ]