Update in-product help experiment fieldtrial test for data saver

This CL updates the testing configuration for the in-product help
feature for data saver.

BUG=748574

Change-Id: I782c429d67f04eca00c4a56172e0632f59c056a4
Reviewed-on: https://chromium-review.googlesource.com/885089Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532075}

testing/variations/fieldtrial_testing_config.json

@@ -238,12 +238,14 @@
             ],
             "experiments": [
                 {
-                    "name": "Tracking",
+                    "name": "EnabledTracking",
                     "params": {
                         "availability": "any",
-                        "event_trigger": "name:data_saver_detail_iph_trigger;comparator:==0;window:90;storage:360",
-                        "event_used": "name:data_saver_overview_opened;comparator:<=1;window:90;storage:360",
-                        "session_rate": "<0"
+                        "event_data_saved": "name:data_saved_page_load;comparator:>=1;window:90;storage:360",
+                        "event_trigger": "name:data_saver_detail_iph_would_have_triggered;comparator:==0;window:90;storage:360",
+                        "event_used": "name:data_saver_overview_opened;comparator:==0;window:90;storage:360",
+                        "session_rate": "==0",
+                        "tracking_only": "true"
                     },
                     "enable_features": [
                         "IPH_DataSaverDetail"