Create a new chrome/browser/apps folder and move PlatformAppService there.

chrome/browser/profiles/profile_dependency_manager.cc

Index: chrome/browser/profiles/profile_dependency_manager.cc
diff --git a/chrome/browser/profiles/profile_dependency_manager.cc b/chrome/browser/profiles/profile_dependency_manager.cc
index a95341877307a339b168eba694347f0831b252ae..91db59507c5139c62e8712c9a9ab1f35c2517432 100644
--- a/chrome/browser/profiles/profile_dependency_manager.cc
+++ b/chrome/browser/profiles/profile_dependency_manager.cc
@@ -19,7 +19,6 @@
 #include "chrome/browser/extensions/app_restore_service_factory.h"
 #include "chrome/browser/extensions/api/tab_capture/tab_capture_registry_factory.h"
 #include "chrome/browser/extensions/extension_system_factory.h"
-#include "chrome/browser/extensions/platform_app_service_factory.h"
 #include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/google/google_url_tracker_factory.h"
 #include "chrome/browser/history/history_service_factory.h"
@@ -28,6 +27,7 @@
 #include "chrome/browser/media_gallery/media_galleries_preferences_factory.h"
 #include "chrome/browser/notifications/desktop_notification_service_factory.h"
 #include "chrome/browser/password_manager/password_store_factory.h"
+#include "chrome/browser/platform_apps/platform_app_service_factory.h"
 #include "chrome/browser/plugins/plugin_prefs_factory.h"
 #include "chrome/browser/predictors/autocomplete_action_predictor_factory.h"
 #include "chrome/browser/predictors/predictor_database_factory.h"
@@ -224,8 +224,8 @@ void ProfileDependencyManager::AssertFactoriesBuilt() {
   extensions::CommandServiceFactory::GetInstance();
   extensions::SuggestedLinksRegistryFactory::GetInstance();
   extensions::ExtensionSystemFactory::GetInstance();
-  extensions::PlatformAppServiceFactory::GetInstance();
   extensions::TabCaptureRegistryFactory::GetInstance();
+  platform_apps::PlatformAppServiceFactory::GetInstance();
 #endif
   FaviconServiceFactory::GetInstance();
   FindBarStateFactory::GetInstance();