Omnibox UI Experiments: Make suggestions dropdown match omnibox width.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 7b0853fb0ce3ccfed08a6aa28a395ae856b8f198..6b8a0db96c4f3a11010239dc4ad5b149ec34a42b 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2996,6 +2996,11 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kOmniboxUIVerticalLayoutDescription, kOsDesktop,
      FEATURE_VALUE_TYPE(omnibox::kUIExperimentVerticalLayout)},
 
+    {"omnibox-ui-narrow-dropdown",
+     flag_descriptions::kOmniboxUINarrowDropdownName,
+     flag_descriptions::kOmniboxUINarrowDropdownDescription, kOsDesktop,
+     FEATURE_VALUE_TYPE(omnibox::kUIExperimentNarrowDropdown)},
+
     {"omnibox-ui-vertical-margin",
      flag_descriptions::kOmniboxUIVerticalMarginName,
      flag_descriptions::kOmniboxUIVerticalMarginDescription, kOsDesktop,