[Extensions] Make chrome://extensions use developerPrivate for inspect

chrome/browser/extensions/api/developer_private/developer_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_DEVELOPER_PRIVATE_DEVELOPER_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DEVELOPER_PRIVATE_DEVELOPER_PRIVATE_API_H_
 
 #include <set>
 
 #include "base/files/file.h"
@@ skipping 206 matching lines @@
                                             ItemInspectViewList* result);
 
   linked_ptr<developer::ItemInspectView> constructInspectView(
       const GURL& url,
       int render_process_id,
       int render_view_id,
       bool incognito,
       bool generated_background_page);
 };
 
-class DeveloperPrivateInspectFunction : public ChromeSyncExtensionFunction {
+class DeveloperPrivateInspectFunction : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("developerPrivate.inspect",
                              DEVELOPERPRIVATE_INSPECT)
 
  protected:
   ~DeveloperPrivateInspectFunction() override;
 
   // ExtensionFunction:
-  bool RunSync() override;
+  ResponseAction Run() override;
 };
 
 class DeveloperPrivateAllowFileAccessFunction
     : public DeveloperPrivateAPIFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("developerPrivate.allowFileAccess",
                              DEVELOPERPRIVATE_ALLOWFILEACCESS);
 
  protected:
   ~DeveloperPrivateAllowFileAccessFunction() override;
@@ skipping 226 matching lines @@
 
   // ExtensionFunction:
   bool RunAsync() override;
 };
 
 }  // namespace api
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DEVELOPER_PRIVATE_DEVELOPER_PRIVATE_API_H_