Omnibox UI Experiments: Make suggestions dropdown match omnibox width.

components/omnibox/browser/omnibox_field_trial.cc

Index: components/omnibox/browser/omnibox_field_trial.cc
diff --git a/components/omnibox/browser/omnibox_field_trial.cc b/components/omnibox/browser/omnibox_field_trial.cc
index 32433ba587ffad502942fed906354846f1031f0f..a814bb1d1190aa5b909828e9b9d1a204e1b322c9 100644
--- a/components/omnibox/browser/omnibox_field_trial.cc
+++ b/components/omnibox/browser/omnibox_field_trial.cc
@@ -91,6 +91,10 @@ const base::Feature kUIExperimentMaxAutocompleteMatches{
     "OmniboxUIExperimentMaxAutocompleteMatches",
     base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Feature used for the omnibox narrow suggestions dropdown UI experiment.
+const base::Feature kUIExperimentNarrowDropdown{
+    "OmniboxUIExperimentNarrowDropdown", base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Feature used for the vertical margin UI experiment.
 const base::Feature kUIExperimentVerticalLayout{
     "OmniboxUIExperimentVerticalLayout", base::FEATURE_DISABLED_BY_DEFAULT};