Adding a parameter for previews NQE triggering threshold

components/previews/core/previews_io_data.cc

Index: components/previews/core/previews_io_data.cc
diff --git a/components/previews/core/previews_io_data.cc b/components/previews/core/previews_io_data.cc
index 9c333b2a6f24bd40a42014c98b563fa1244b5831..0a7af37fda2653d9ddf580fe6411677afb1a1d84 100644
--- a/components/previews/core/previews_io_data.cc
+++ b/components/previews/core/previews_io_data.cc
@@ -113,7 +113,7 @@ bool PreviewsIOData::ShouldAllowPreview(const net::URLRequest& request,
     return false;
   }
   if (network_quality_estimator->GetEffectiveConnectionType() >
-      net::EFFECTIVE_CONNECTION_TYPE_SLOW_2G) {
+      params::EffectiveConnectionTypeThreshold()) {
     LogPreviewsEligibilityReason(PreviewsEligibilityReason::NETWORK_NOT_SLOW,
                                  type);
     return false;