Refactor "IsUnderDriveMountPoint" in v2 app code for generalization to non-Drive volumes.

chrome/browser/extensions/api/file_system/file_system_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_FILE_SYSTEM_FILE_SYSTEM_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_FILE_SYSTEM_FILE_SYSTEM_API_H_
 
 #include <vector>
 
 #include "base/files/file_path.h"
@@ skipping 139 matching lines @@
                   ui::SelectFileDialog::Type picker_type);
 
  private:
   void SetInitialPathOnFileThread(const base::FilePath& suggested_name,
                                   const base::FilePath& previous_path);
 
   // FilesSelected and FileSelectionCanceled are called by the file picker.
   void FilesSelected(const std::vector<base::FilePath>& path);
   void FileSelectionCanceled();
 
-  // Check if the chosen directory is or is an ancestor of a sensitive
-  // directory. If so, show a dialog to confirm that the user wants to open the
-  // directory. Calls OnDirectoryAccessConfirmed if the directory isn't
-  // sensitive or the user chooses to open it. Otherwise, calls
-  // FileSelectionCanceled.
+  // Check if |check_path|, the canonicalized form of the chosen directory
+  // |paths|, is or is an ancestor of a sensitive directory. If so, show a
+  // dialog to confirm that the user wants to open the directory.
+  // Calls OnDirectoryAccessConfirmed if the directory isn't sensitive or the
+  // user chooses to open it. Otherwise, calls FileSelectionCanceled.
   void ConfirmDirectoryAccessOnFileThread(
+      const base::FilePath& check_path,
       const std::vector<base::FilePath>& paths,
       content::WebContents* web_contents);
   void OnDirectoryAccessConfirmed(const std::vector<base::FilePath>& paths);
 
   base::FilePath initial_path_;
 };
 
 class FileSystemRetainEntryFunction : public ChromeAsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileSystem.retainEntry", FILESYSTEM_RETAINENTRY)
@@ skipping 30 matching lines @@
   DECLARE_EXTENSION_FUNCTION("fileSystem.restoreEntry", FILESYSTEM_RESTOREENTRY)
 
  protected:
   virtual ~FileSystemRestoreEntryFunction() {}
   virtual bool RunAsync() OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_FILE_SYSTEM_FILE_SYSTEM_API_H_