Remove obsolete flag.

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 780b412a5e2f5048daaf7a036de2bb5b9903efc0..211492d9334c38a60951e47608ead981cf56804c 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1720,10 +1720,6 @@ const FeatureEntry kFeatureEntries[] = {
     {"tab-management-experiment-type", IDS_FLAGS_HERB_PROTOTYPE_CHOICES_NAME,
      IDS_FLAGS_HERB_PROTOTYPE_CHOICES_DESCRIPTION, kOsAndroid,
      MULTI_VALUE_TYPE(kHerbPrototypeChoices)},
-    {"enable-tab-switcher-in-document-mode",
-     IDS_FLAGS_TAB_SWITCHER_IN_DOCUMENT_MODE_NAME,
-     IDS_FLAGS_TAB_SWITCHER_IN_DOCUMENT_MODE_DESCRIPTION, kOsAndroid,
-     SINGLE_VALUE_TYPE(switches::kEnableTabSwitcherInDocumentMode)},
     {"app-link", IDS_FLAGS_ENABLE_APP_LINK_NAME,
      IDS_FLAGS_ENABLE_APP_LINK_DESCRIPTION, kOsAndroid,
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAppLink,
@@ -2016,14 +2012,6 @@ bool SkipConditionalFeatureEntry(const FeatureEntry& entry) {
       channel != version_info::Channel::UNKNOWN) {
     return true;
   }
-  // enable-tab-switcher-in-document-mode is only available for Chromium
-  // builds and the Canary channel.
-  if (!strcmp("enable-tab-switcher-in-document-mode",
-              entry.internal_name) &&
-      channel != version_info::Channel::CANARY &&
-      channel != version_info::Channel::UNKNOWN) {
-    return true;
-  }
 #endif
 
   // data-reduction-proxy-lo-fi and enable-data-reduction-proxy-lo-fi-preview