Remove extension-to-component migration mechanism

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 7b14c9a6ea83e6f322a32cfadd4009a4f8552076..e9e0ec3e1517f80f8bac4a6120aeb0bfc3f1c7b1 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1306,11 +1306,6 @@ const char kToolbarIconSurfacingBubbleAcknowledged[] =
     "toolbar_icon_surfacing_bubble_acknowledged";
 const char kToolbarIconSurfacingBubbleLastShowTime[] =
     "toolbar_icon_surfacing_bubble_show_time";
-
-// Used to track component actions in the toolbar that were migrated from
-// extensions.
-const char kToolbarMigratedComponentActionStatus[] =
-    "toolbar_migrated_component_action_status";
 #endif
 
 #if BUILDFLAG(ENABLE_WEBRTC)
@@ -1976,8 +1971,8 @@ const char kSystemTimezoneAutomaticDetectionPolicy[] =
 // Pref name for the policy controlling whether to enable Media Router.
 const char kEnableMediaRouter[] = "media_router.enable_media_router";
 #if !defined(OS_ANDROID)
-// Pref name for the policy controlling whether to force the Cast icon to be
-// shown in the toolbar/overflow menu.
+// Pref name for a boolean indicating whether to show the Cast icon in the
+// toolbar/overflow menu. May be policy-controlled.
 const char kShowCastIconInToolbar[] = "media_router.show_cast_icon_in_toolbar";
 #endif  // !defined(OS_ANDROID)
 #endif  // defined(ENABLE_MEDIA_ROUTER)