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 996364164609667d375572871a4ded59fe9e079f..008d6362313a3a24deb7bdad122e0a8a13505026 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -3007,6 +3007,11 @@ 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,