flags: remove enable-site-exploration-ui

This does not remove the backing code or feature.

Bug: 957297
Change-Id: I2dcb70048963d2ab31d5780a051f423f1cc231d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585538
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Auto-Submit: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654849}

chrome/browser/about_flags.cc

@@ -2042,9 +2042,6 @@ const FeatureEntry kFeatureEntries[] = {
          ntp_snippets::kNotificationsFeature,
          kContentSuggestionsNotificationsFeatureVariations,
          "ContentSuggestionsNotifications")},
-    {"enable-site-exploration-ui", flag_descriptions::kSiteExplorationUiName,
-     flag_descriptions::kSiteExplorationUiDescription, kOsAndroid,
-     FEATURE_VALUE_TYPE(ntp_tiles::kSiteExplorationUiFeature)},
 #endif  // OS_ANDROID
     {"user-activation-v2", flag_descriptions::kUserActivationV2Name,
      flag_descriptions::kUserActivationV2Description, kOsAll,

chrome/browser/flag-metadata.json

@@ -1597,11 +1597,6 @@
     // Used for debugging and QA by the autofill team for the indefinite future.
     "expiry_milestone": -1
   },
-  {
-    "name": "enable-site-exploration-ui",
-    // "owners": [ "your-team" ],
-    "expiry_milestone": 76
-  },
   {
     "name": "enable-site-isolation-for-password-sites",
     "owners": [ "site-isolation-dev", "alexmos", "lukasza" ],

chrome/browser/flag_descriptions.cc

@@ -2529,10 +2529,6 @@ const char kShoppingAssistName[] = "Shopping assist exploration";
 const char kShoppingAssistDescription[] =
     "Show some shopping assistance when available";
 
-const char kSiteExplorationUiName[] = "Site Exploration UI";
-const char kSiteExplorationUiDescription[] =
-    "Show site suggestions in the Exploration UI";
-
 const char kSiteIsolationForPasswordSitesName[] =
     "Site Isolation For Password Sites";
 const char kSiteIsolationForPasswordSitesDescription[] =

chrome/browser/flag_descriptions.h

@@ -1512,9 +1512,6 @@ extern const char kSetMarketUrlForTestingDescription[];
 extern const char kShoppingAssistName[];
 extern const char kShoppingAssistDescription[];
 
-extern const char kSiteExplorationUiName[];
-extern const char kSiteExplorationUiDescription[];
-
 extern const char kSiteIsolationForPasswordSitesName[];
 extern const char kSiteIsolationForPasswordSitesDescription[];
 

components/ntp_tiles/constants.h

@@ -24,6 +24,7 @@ extern const base::Feature kPopularSitesBakedInContentFeature;
 extern const base::Feature kNtpMostLikelyFaviconsFromServerFeature;
 
 // Feature to provide site exploration tiles in addition to personal tiles.
+// TODO(https://crbug.com/957297): Remove this.
 extern const base::Feature kSiteExplorationUiFeature;
 
 // If this feature is enabled, we enable popular sites in the suggestions UI.