Remove many delegates, let's see what breaks

chrome/browser/notifications/web_notification_delegate.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/notifications/web_notification_delegate.h"
 
 #include "base/feature_list.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/nullable_string16.h"
+#include "chrome/browser/notifications/notification_common.h"
 #include "chrome/browser/notifications/notification_display_service.h"
 #include "chrome/browser/notifications/notification_display_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_list.h"
-#include "chrome/browser/ui/browser_window.h"
-#include "chrome/browser/ui/exclusive_access/exclusive_access_context.h"
-#include "chrome/browser/ui/exclusive_access/exclusive_access_manager.h"
-#include "chrome/browser/ui/tabs/tab_strip_model.h"
-#include "content/public/browser/web_contents.h"
-#include "ui/message_center/notifier_settings.h"
 
-using message_center::NotifierId;
-
-namespace features {
-
-const base::Feature kAllowFullscreenWebNotificationsFeature{
-  "FSNotificationsWeb", base::FEATURE_ENABLED_BY_DEFAULT
-};
-
-} // namespace features
 
 WebNotificationDelegate::WebNotificationDelegate(
     NotificationCommon::Type notification_type,
     Profile* profile,
     const std::string& notification_id,
     const GURL& origin)
     : notification_type_(notification_type),
       profile_(profile),
       notification_id_(notification_id),
       origin_(origin) {}
 
 WebNotificationDelegate::~WebNotificationDelegate() {}
 
 std::string WebNotificationDelegate::id() const {
   return notification_id_;
 }
 
 bool WebNotificationDelegate::SettingsClick() {
 #if !defined(OS_CHROMEOS)
   NotificationCommon::OpenNotificationSettings(profile_);
   return true;
 #else
   return false;
 #endif
 }
 
 bool WebNotificationDelegate::ShouldDisplaySettingsButton() {
-  return true;
+  return notification_type_ != NotificationCommon::EXTENSION;
 }
 
 bool WebNotificationDelegate::ShouldDisplayOverFullscreen() const {
-#if !defined(OS_ANDROID)
-  // Check to see if this notification comes from a webpage that is displaying
-  // fullscreen content.
-  for (auto* browser : *BrowserList::GetInstance()) {
-    // Only consider the browsers for the profile that created the notification
-    if (browser->profile() != profile_)
-      continue;
+  NotificationDisplayService* display_service =
+      NotificationDisplayServiceFactory::GetForProfile(profile_);
 
-    const content::WebContents* active_contents =
-        browser->tab_strip_model()->GetActiveWebContents();
-    if (!active_contents)
-      continue;
-
-    // Check to see if
-    //  (a) the active tab in the browser shares its origin with the
-    //      notification.
-    //  (b) the browser is fullscreen
-    //  (c) the browser has focus.
-    if (active_contents->GetURL().GetOrigin() == origin_ &&
-        browser->exclusive_access_manager()->context()->IsFullscreen() &&
-        browser->window()->IsActive()) {
-      bool enabled = base::FeatureList::IsEnabled(
-          features::kAllowFullscreenWebNotificationsFeature);
-      if (enabled) {
-        UMA_HISTOGRAM_ENUMERATION("Notifications.Display_Fullscreen.Shown",
-                                  NotifierId::WEB_PAGE,
-                                  NotifierId::SIZE);
-      } else {
-        UMA_HISTOGRAM_ENUMERATION(
-            "Notifications.Display_Fullscreen.Suppressed",
-            NotifierId::WEB_PAGE,
-            NotifierId::SIZE);
-      }
-      return enabled;
-    }
-  }
-#endif
-
-  return false;
+  return display_service->ShouldDisplayOverFullscreen(origin_,
+                                                      notification_type_);
 }
 
-void WebNotificationDelegate::Display() {}
-
 void WebNotificationDelegate::Close(bool by_user) {
   auto* display_service =
       NotificationDisplayServiceFactory::GetForProfile(profile_);
   display_service->ProcessNotificationOperation(
       NotificationCommon::CLOSE, notification_type_, origin().spec(),
       notification_id_, -1, base::NullableString16());
 }
 
 void WebNotificationDelegate::Click() {
   auto* display_service =
@@ skipping 15 matching lines @@
 void WebNotificationDelegate::ButtonClickWithReply(
     int button_index,
     const base::string16& reply) {
   auto* display_service =
       NotificationDisplayServiceFactory::GetForProfile(profile_);
   display_service->ProcessNotificationOperation(
       NotificationCommon::CLICK, notification_type_, origin().spec(),
       notification_id_, button_index,
       base::NullableString16(reply, false /* is_null */));
 }