[Extensions] DCHECK that ExtensionFunctions respond (and only once)

chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_BOOKMARK_MANAGER_PRIVATE_BOOKMARK_MANAGER_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_BOOKMARK_MANAGER_PRIVATE_BOOKMARK_MANAGER_PRIVATE_API_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 179 matching lines @@
   DECLARE_EXTENSION_FUNCTION("bookmarkManagerPrivate.sortChildren",
                              BOOKMARKMANAGERPRIVATE_SORTCHILDREN)
 
  protected:
   ~BookmarkManagerPrivateSortChildrenFunction() override {}
 
   // ExtensionFunction:
   bool RunOnReady() override;
 };
 
-class BookmarkManagerPrivateGetStringsFunction : public AsyncExtensionFunction {
+class BookmarkManagerPrivateGetStringsFunction
+    : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("bookmarkManagerPrivate.getStrings",
                              BOOKMARKMANAGERPRIVATE_GETSTRINGS)
 
  protected:
   ~BookmarkManagerPrivateGetStringsFunction() override {}
 
-  // ExtensionFunction:
-  bool RunAsync() override;
+  // UIThreadExtensionFunction:
+  ResponseAction Run() override;
 };
 
 class BookmarkManagerPrivateStartDragFunction
     : public extensions::BookmarksFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("bookmarkManagerPrivate.startDrag",
                              BOOKMARKMANAGERPRIVATE_STARTDRAG)
 
  protected:
   ~BookmarkManagerPrivateStartDragFunction() override {}
@@ skipping 180 matching lines @@
  protected:
   ~BookmarkManagerPrivateGetRedoInfoFunction() override {}
 
   // ExtensionFunction:
   bool RunOnReady() override;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_BOOKMARK_MANAGER_PRIVATE_BOOKMARK_MANAGER_PRIVATE_API_H_