Revert of Deprecate native and extension notification delegates.

chrome/browser/extensions/api/notifications/extension_notification_handler.cc

Index: chrome/browser/extensions/api/notifications/extension_notification_handler.cc
diff --git a/chrome/browser/extensions/api/notifications/extension_notification_handler.cc b/chrome/browser/extensions/api/notifications/extension_notification_handler.cc
index 645a1f5ac4edb49dac8b5f55c5d43484f7bfd744..61fc1b8427f650dc2ac3660179e544a9f5959d8c 100644
--- a/chrome/browser/extensions/api/notifications/extension_notification_handler.cc
+++ b/chrome/browser/extensions/api/notifications/extension_notification_handler.cc
@@ -5,28 +5,16 @@
 #include "chrome/browser/extensions/api/notifications/extension_notification_handler.h"
 
 #include "base/logging.h"
-#include "base/metrics/histogram_macros.h"
 #include "base/strings/nullable_string16.h"
 #include "base/strings/string_piece.h"
 #include "chrome/browser/extensions/api/notifications/extension_notification_display_helper.h"
 #include "chrome/browser/extensions/api/notifications/extension_notification_display_helper_factory.h"
-#include "chrome/browser/notifications/notification_common.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/notifications.h"
-#include "chrome/common/features.h"
-#include "extensions/browser/app_window/app_window.h"
-#include "extensions/browser/app_window/app_window_registry.h"
-#include "extensions/browser/app_window/native_app_window.h"
 #include "extensions/common/constants.h"
-#include "ui/message_center/notifier_settings.h"
 #include "url/gurl.h"
 
 namespace extensions {
-
-namespace notifications = api::notifications;
-
-const base::Feature kAllowFullscreenAppNotificationsFeature{
-    "FSNotificationsApp", base::FEATURE_ENABLED_BY_DEFAULT};
 
 namespace {
 
@@ -111,37 +99,6 @@
   NOTREACHED();
 }
 
-// Should only display when fullscreen if this app is the source of the
-// fullscreen window.
-bool ExtensionNotificationHandler::ShouldDisplayOnFullScreen(
-    Profile* profile,
-    const std::string& origin) {
-  DCHECK(profile);
-  DCHECK(!GetExtensionId(origin).empty());
-  AppWindowRegistry::AppWindowList windows =
-      AppWindowRegistry::Get(profile)->GetAppWindowsForApp(
-          GetExtensionId(origin));
-  for (auto* window : windows) {
-    // Window must be fullscreen and visible
-    if (window->IsFullscreen() && window->GetBaseWindow()->IsActive()) {
-      bool enabled =
-          base::FeatureList::IsEnabled(kAllowFullscreenAppNotificationsFeature);
-      if (enabled) {
-        UMA_HISTOGRAM_ENUMERATION("Notifications.Display_Fullscreen.Shown",
-                                  message_center::NotifierId::APPLICATION,
-                                  message_center::NotifierId::SIZE);
-      } else {
-        UMA_HISTOGRAM_ENUMERATION("Notifications.Display_Fullscreen.Suppressed",
-                                  message_center::NotifierId::APPLICATION,
-                                  message_center::NotifierId::SIZE);
-      }
-      return enabled;
-    }
-  }
-
-  return false;
-}
-
 void ExtensionNotificationHandler::SendEvent(
     Profile* profile,
     const std::string& extension_id,