Re-prompt Chrome users to run the SRT when a finch param changes.

chrome/browser/prefs/chrome_pref_service_factory.cc

Index: chrome/browser/prefs/chrome_pref_service_factory.cc
diff --git a/chrome/browser/prefs/chrome_pref_service_factory.cc b/chrome/browser/prefs/chrome_pref_service_factory.cc
index dc0e2f035d46b83d62a44c552e3c8c8e6010d2d0..cb516bd62aafff4fcb1505370b7cdcde6bc3dbf3 100644
--- a/chrome/browser/prefs/chrome_pref_service_factory.cc
+++ b/chrome/browser/prefs/chrome_pref_service_factory.cc
@@ -217,6 +217,14 @@ const PrefHashFilter::TrackedPreferenceMetadata kTrackedPrefs[] = {
     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
     PrefHashFilter::VALUE_PERSONAL
   },
+#if defined(OS_WIN)
+  {
+    22, prefs::kSwReporterPromptSeed,
+    PrefHashFilter::ENFORCE_ON_LOAD,
+    PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
+    PrefHashFilter::VALUE_IMPERSONAL
+  },
+#endif
   // See note at top, new items added here also need to be added to
   // histograms.xml's TrackedPreference enum.
 };