Network Error Logging: Update field trial to include NEL

Bug: 799253
Change-Id: Id1fceef526edee6f239c0d7ca0ed8e091b4c638f
Reviewed-on: https://chromium-review.googlesource.com/1052888Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Douglas Creager <dcreager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557942}

testing/variations/fieldtrial_testing_config.json

@@ -3003,7 +3003,7 @@
             ]
         }
     ],
-    "ReportingAPI": [
+    "ReportingAPIAndNetworkErrorLogging": [
         {
             "platforms": [
                 "android",
@@ -3015,8 +3015,9 @@
             ],
             "experiments": [
                 {
-                    "name": "ReportingEnabled",
+                    "name": "ReportingAndNELEnabled",
                     "enable_features": [
+                        "NetworkErrorLogging",
                         "Reporting"
                     ]
                 }