[Extensions] Make chrome://extensions use developerPrivate for error calls

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 29 matching lines @@
 
 class EntryPicker;
 class EntryPickerClient;
 
 namespace developer_private {
 
 struct ItemInfo;
 struct ItemInspectView;
 struct ProjectInfo;
 
+namespace RequestFileSource {
+struct Params;
+}
+
 }  // namespace developer_private
 
 }  // namespace api
 
 namespace developer = api::developer_private;
 
 typedef std::vector<linked_ptr<developer::ItemInfo> > ItemInfoList;
 typedef std::vector<linked_ptr<developer::ProjectInfo> > ProjectInfoList;
 typedef std::vector<linked_ptr<developer::ItemInspectView> >
     ItemInspectViewList;
@@ skipping 366 matching lines @@
 
  private:
   int pending_copy_operations_count_;
 
   // This is set to false if any of the copyFile operations fail on
   // call of the API. It is returned as a response of the API call.
   bool success_;
 };
 
 class DeveloperPrivateRequestFileSourceFunction
-    : public ChromeAsyncExtensionFunction {
+    : public DeveloperPrivateAPIFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("developerPrivate.requestFileSource",
                              DEVELOPERPRIVATE_REQUESTFILESOURCE);
-
   DeveloperPrivateRequestFileSourceFunction();
 
  protected:
   ~DeveloperPrivateRequestFileSourceFunction() override;
-
-  // ExtensionFunction:
-  bool RunAsync() override;
+  ResponseAction Run() override;
 
  private:
-  void LaunchCallback(const base::DictionaryValue& results);
+  void Finish(const std::string& file_contents);
+
+  scoped_ptr<api::developer_private::RequestFileSource::Params> params_;
 };
 
 class DeveloperPrivateOpenDevToolsFunction
-    : public ChromeAsyncExtensionFunction {
+    : public DeveloperPrivateAPIFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("developerPrivate.openDevTools",
                              DEVELOPERPRIVATE_OPENDEVTOOLS);
-
   DeveloperPrivateOpenDevToolsFunction();
 
  protected:
   ~DeveloperPrivateOpenDevToolsFunction() override;
-
-  // ExtensionFunction:
-  bool RunAsync() override;
+  ResponseAction Run() override;
 };
 
 }  // namespace api
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DEVELOPER_PRIVATE_DEVELOPER_PRIVATE_API_H_