Local NTP, Realbox: add a feature for confirming suggestion removal

We plan to add a confirmation dialog (or other similarly useful UI) to
either confirm that the user wants to delete autocomplete matches or do
then undo (depending on where we land UX-wise).

[email protected]

Bug: 1013837
Change-Id: I8ec1942cbc519b2da18e23b04dcb00884719c6ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866061
Commit-Queue: Dan Beam <[email protected]>
Auto-Submit: Dan Beam <[email protected]>
Reviewed-by: Tommy Li <[email protected]>
Cr-Commit-Position: refs/heads/master@{#707047}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 6c536a18..b2801385e 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -3080,6 +3080,11 @@
      flag_descriptions::kChromeColorsCustomColorPickerDescription, kOsDesktop,
      FEATURE_VALUE_TYPE(features::kChromeColorsCustomColorPicker)},
 
+    {"ntp-confirm-suggestion-removals",
+     flag_descriptions::kNtpConfirmSuggestionRemovalsName,
+     flag_descriptions::kNtpConfirmSuggestionRemovalsDescription, kOsDesktop,
+     FEATURE_VALUE_TYPE(features::kConfirmNtpSuggestionRemovals)},
+
     {"ntp-customization-menu-v2",
      flag_descriptions::kNtpCustomizationMenuV2Name,
      flag_descriptions::kNtpCustomizationMenuV2Description, kOsDesktop,