Use the user's preferred downloads directory for creating the initial download file.

content/browser/download/download_manager_impl_unittest.cc

 // 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.
 
 #include <set>
 #include <string>
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 163 matching lines @@
       DownloadItem*, const base::Closure&));
   MOCK_METHOD1(ShouldOpenDownload, bool(DownloadItem*));
   MOCK_METHOD0(GenerateFileHash, bool());
   MOCK_METHOD1(AddItemToPersistentStore, void(DownloadItem*));
   MOCK_METHOD1(UpdateItemInPersistentStore, void(DownloadItem*));
   MOCK_METHOD2(UpdatePathForItemInPersistentStore,
                void(DownloadItem*, const FilePath&));
   MOCK_METHOD1(RemoveItemFromPersistentStore, void(DownloadItem*));
   MOCK_METHOD2(RemoveItemsFromPersistentStoreBetween, void(
       base::Time remove_begin, base::Time remove_end));
-  MOCK_METHOD4(GetSaveDir, void(WebContents*, FilePath*, FilePath*, bool*));
+  MOCK_METHOD4(GetSaveDir, void(content::BrowserContext*,
+                                FilePath*, FilePath*, bool*));
   MOCK_METHOD5(ChooseSavePath, void(
       WebContents*, const FilePath&, const FilePath::StringType&,
       bool, const content::SavePackagePathPickedCallback&));
 };
 
 MockDownloadManagerDelegate::MockDownloadManagerDelegate() {}
 
 MockDownloadManagerDelegate::~MockDownloadManagerDelegate() {}
 
 class MockDownloadFileManager : public DownloadFileManager {
@@ skipping 451 matching lines @@
               UpdateItemInPersistentStore(&item));
   EXPECT_CALL(item, GetState())
       .WillRepeatedly(Return(DownloadItem::CANCELLED));
   EXPECT_CALL(item, GetDbHandle())
       .WillRepeatedly(Return(db_handle));
 
   EXPECT_CALL(item, OffThreadCancel());
   DownloadStopped(&item);
   EXPECT_EQ(NULL, download_manager_->GetActiveDownloadItem(download_id));
 }