Pass BrowserContext to drive::MountPointProviderDelegate.

chrome/browser/chromeos/drive/file_system_backend_delegate.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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_BACKEND_DELEGATE_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_BACKEND_DELEGATE_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/chromeos/fileapi/file_system_backend_delegate.h"
 
+namespace content {
+class BrowserContext;
+}  // namespace content
+
 namespace fileapi {
 class ExternalMountPoints;
 }  // namespace fileapi
 
 namespace drive {
 
 // Delegate implementation of the some methods in chromeos::FileSystemBackend
 // for Drive file system.
 class FileSystemBackendDelegate : public chromeos::FileSystemBackendDelegate {
  public:
+  // |browser_context| is currently used to take the ExternalMountPoints.
   explicit FileSystemBackendDelegate(
-      fileapi::ExternalMountPoints* mount_points);
+      content::BrowserContext* browser_context);
   virtual ~FileSystemBackendDelegate();
 
   // FileSystemBackend::Delegate overrides.
   virtual fileapi::AsyncFileUtil* GetAsyncFileUtil(
       fileapi::FileSystemType type) OVERRIDE;
   virtual scoped_ptr<webkit_blob::FileStreamReader> CreateFileStreamReader(
       const fileapi::FileSystemURL& url,
       int64 offset,
       const base::Time& expected_modification_time,
       fileapi::FileSystemContext* context) OVERRIDE;
   virtual scoped_ptr<fileapi::FileStreamWriter> CreateFileStreamWriter(
       const fileapi::FileSystemURL& url,
       int64 offset,
       fileapi::FileSystemContext* context) OVERRIDE;
   virtual fileapi::FileSystemOperation* CreateFileSystemOperation(
       const fileapi::FileSystemURL& url,
       fileapi::FileSystemContext* context,
       base::PlatformFileError* error_code) OVERRIDE;
 
  private:
   scoped_refptr<fileapi::ExternalMountPoints> mount_points_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemBackendDelegate);
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_BACKEND_DELEGATE_H_