Pass BrowserContext to drive::MountPointProviderDelegate.

chrome/browser/chromeos/drive/file_system_backend_delegate.cc

 // 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.
 
 #include "chrome/browser/chromeos/drive/file_system_backend_delegate.h"
 
 #include "chrome/browser/chromeos/drive/remote_file_stream_writer.h"
 #include "chrome/browser/chromeos/fileapi/remote_file_system_operation.h"
+#include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "webkit/browser/blob/file_stream_reader.h"
 #include "webkit/browser/fileapi/external_mount_points.h"
 #include "webkit/browser/fileapi/file_system_task_runners.h"
 #include "webkit/browser/fileapi/remote_file_system_proxy.h"
 
 using content::BrowserThread;
 
 namespace drive {
 
 FileSystemBackendDelegate::FileSystemBackendDelegate(
-    fileapi::ExternalMountPoints* mount_points)
-    : mount_points_(mount_points) {
+    content::BrowserContext* browser_context)
+    : mount_points_(content::BrowserContext::GetMountPoints(browser_context)) {
 }
 
 FileSystemBackendDelegate::~FileSystemBackendDelegate() {
 }
 
 fileapi::AsyncFileUtil* FileSystemBackendDelegate::GetAsyncFileUtil(
     fileapi::FileSystemType type) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK_EQ(fileapi::kFileSystemTypeDrive, type);
 
@@ skipping 51 matching lines @@
       mount_points_->GetRemoteFileSystemProxy(url.filesystem_id());
   if (!proxy) {
     *error_code = base::PLATFORM_FILE_ERROR_NOT_FOUND;
     return NULL;
   }
 
   return new chromeos::RemoteFileSystemOperation(proxy);
 }
 
 }  // namespace drive