[omnibox] Enable the Remove Suggestion UI Flag by default

This feature surfaces an X button next to deletable suggestions in the
omnibox.

Enable this flag by default for rollout with M83.

Bug: 1205
Change-Id: Ic3f18d20aeef3959b8ff3f7ab1338bb17db1ca33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124907Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754200}

chrome/browser/flag_descriptions.cc

@@ -2799,9 +2799,8 @@ const char kOmniboxShortBookmarkSuggestionsDescription[] =
 const char kOmniboxSuggestionTransparencyOptionsName[] =
     "Omnibox Suggestion Transparency Options";
 const char kOmniboxSuggestionTransparencyOptionsDescription[] =
-    "Improves transparency of and control over omnibox suggestions. This "
-    "includes \"Why this Suggestion?\" and user controls to delete "
-    "personalized suggestions.";
+    "Surfaces an X button next to deletable omnibox suggestions. This is to "
+    "make the suggestion removal feature more discoverable.";
 
 const char kOmniboxTabSwitchSuggestionsName[] =
     "Omnibox tab switch suggestions";

components/omnibox/common/omnibox_features.cc

@@ -124,11 +124,10 @@ const base::Feature kExperimentalKeywordMode{"OmniboxExperimentalKeywordMode",
 const base::Feature kOmniboxPedalSuggestions{"OmniboxPedalSuggestions",
                                              base::FEATURE_DISABLED_BY_DEFAULT};
 
-// Feature used for UI that improves transparency of and control over omnibox
-// suggestions. This includes "Why this Suggestion?" and user controls to delete
-// personalized suggestions. This will be eventually enabled by default.
+// Feature that surfaces an X button next to deletable omnibox suggestions.
+// This is to make the suggestion removal feature more discoverable.
 const base::Feature kOmniboxSuggestionTransparencyOptions{
-    "OmniboxSuggestionTransparencyOptions", base::FEATURE_DISABLED_BY_DEFAULT};
+    "OmniboxSuggestionTransparencyOptions", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Feature to enable clipboard provider to suggest searching for copied images.
 const base::Feature kEnableClipboardProviderImageSuggestions{

testing/variations/fieldtrial_testing_config.json

@@ -3653,7 +3653,6 @@
                         "OmniboxOnFocusSuggestions",
                         "OmniboxRemoveSuggestionsFromClipboard",
                         "OmniboxRichEntitySuggestions",
-                        "OmniboxSuggestionTransparencyOptions",
                         "OmniboxUIExperimentMaxAutocompleteMatches",
                         "QueryInOmnibox"
                     ]