dpwa: Remove extensions headers from web_app_migration_manager.h.

This CL introduces no behavior changes.

chrome/browser/web_applications/web_app_migration_manager.h must not depend
on extensions, only forward declarations are visible.

This is a preparation CL to remove web_applications_on_extensions GN node.

WebAppProvider will be moved from web_applications_on_extensions to
general web_applications GN node.

Bug: 1065748
Change-Id: Ic74d8cdc9afe77472d13e27d889375add8e732d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517213Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823900}

chrome/browser/web_applications/web_app_migration_manager.h

@@ -11,12 +11,9 @@
 
 #include "base/callback_forward.h"
 #include "base/memory/weak_ptr.h"
+#include "chrome/browser/web_applications/components/app_icon_manager.h"
 #include "chrome/browser/web_applications/components/os_integration_manager.h"
 #include "chrome/browser/web_applications/components/web_app_id.h"
-#include "chrome/browser/web_applications/extensions/bookmark_app_file_handler_manager.h"
-#include "chrome/browser/web_applications/extensions/bookmark_app_icon_manager.h"
-#include "chrome/browser/web_applications/extensions/bookmark_app_registrar.h"
-#include "chrome/browser/web_applications/extensions/bookmark_app_registry_controller.h"
 #include "chrome/browser/web_applications/web_app_registrar.h"
 #include "chrome/common/web_application_info.h"
 
@@ -25,6 +22,13 @@ class ModelError;
 class MetadataBatch;
 }  // namespace syncer
 
+namespace extensions {
+class BookmarkAppRegistrar;
+class BookmarkAppRegistryController;
+class BookmarkAppIconManager;
+class BookmarkAppFileHandlerManager;
+}  // namespace extensions
+
 namespace web_app {
 
 class AbstractWebAppDatabaseFactory;
@@ -77,10 +81,13 @@ class WebAppMigrationManager {
   void ScheduleDestructDatabaseAndCallCallback(bool success);
   void DestructDatabaseAndCallCallback(bool success);
 
-  extensions::BookmarkAppRegistrar bookmark_app_registrar_;
-  extensions::BookmarkAppRegistryController bookmark_app_registry_controller_;
-  extensions::BookmarkAppIconManager bookmark_app_icon_manager_;
-  extensions::BookmarkAppFileHandlerManager bookmark_app_file_handler_manager_;
+  std::unique_ptr<extensions::BookmarkAppRegistrar> bookmark_app_registrar_;
+  std::unique_ptr<extensions::BookmarkAppRegistryController>
+      bookmark_app_registry_controller_;
+  std::unique_ptr<extensions::BookmarkAppIconManager>
+      bookmark_app_icon_manager_;
+  std::unique_ptr<extensions::BookmarkAppFileHandlerManager>
+      bookmark_app_file_handler_manager_;
 
   AbstractWebAppDatabaseFactory* const database_factory_;
   WebAppIconManager* const web_app_icon_manager_;