file_manager: Fix a bug where hosted documents could not be opened without active browser window.

chrome/browser/chromeos/extensions/file_manager/open_with_browser.h

 // Copyright 2013 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.
 //
 // This file provides utilities for opening files with the browser.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_OPEN_WITH_BROWSER_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_OPEN_WITH_BROWSER_H_
 
 #include "base/files/file_path.h"
 
 class Browser;
 class Profile;
 
 namespace file_manager {
 namespace util {
 
-// Opens the file specified by |file_path| with the browser. This function takes
-// care of the following intricacies:
+// Opens the file specified by |file_path| with the browser for
+// |profile|. This function takes care of the following intricacies:
 //
+// - If there is no active browser window, open it.
 // - If the file is a Drive hosted document, the hosted document will be
 //   opened in the browser by extracting the right URL for the file.
 // - If the file is a CRX file, the CRX file will be installed.
 // - If the file is on Drive, the file will be downloaded from Drive as
 //   needed.
 //
 // Returns false if failed to open. This happens if the file type is unknown.
-bool OpenFileWithBrowser(Browser* browser, const base::FilePath& file_path);
+bool OpenFileWithBrowser(Profile* profile, const base::FilePath& file_path);
 
 // Checks whether a pepper plugin for |file_extension| is enabled.
 bool ShouldBeOpenedWithPlugin(
     Profile* profile,
     const base::FilePath::StringType& file_extension);
 
 }  // namespace util
 }  // namespace file_manager
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_OPEN_WITH_BROWSER_H_