CrOS - Fix crash when pressing Enter in file browser dialog

chrome/browser/extensions/extension_file_browser_private_api.h

 // Copyright (c) 2011 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_EXTENSION_FILE_BROWSER_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_FILE_BROWSER_PRIVATE_API_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 149 matching lines @@
   void GetLocalPathsOnFileThread(const UrlList& file_urls,
                                  const std::string& internal_task_id);
 
   // Callback with converted local paths.
   virtual void GetLocalPathsResponseOnUIThread(const FilePathList& files,
       const std::string& internal_task_id) {}
 
   // Get the callback for the hosting tab.
   const Callback& GetCallback() const;
 
+  // Remove the callback for the hosting tab.
+  void RemoveCallback();
+
  private:
   // Figure out the tab_id of the hosting tab.
   int32 GetTabId() const;
 };
 
 // Select a single file.  Closes the dialog window.
 class SelectFileFunction
     : public FileDialogFunction {
  public:
   SelectFileFunction() {}
@@ skipping 77 matching lines @@
   virtual ~FileDialogStringsFunction() {}
 
   // SyncExtensionFunction overrides.
   virtual bool RunImpl() OVERRIDE;
 
  private:
   DECLARE_EXTENSION_FUNCTION_NAME("fileBrowserPrivate.getStrings");
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FILE_BROWSER_PRIVATE_API_H_