Downloads: replace BrowserThread::FILE with task scheduler.

content/browser/download/mock_download_file.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 "content/browser/download/mock_download_file.h"
+
+#include "base/bind.h"
+#include "content/public/browser/browser_thread.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 using ::testing::_;
 using ::testing::Return;
 
 namespace content {
 namespace {
 
-void SuccessRun(
+void SuccessRun(const DownloadFile::InitializeCallback& initialize_callback) {
+  initialize_callback.Run(DOWNLOAD_INTERRUPT_REASON_NONE);
+}
+
+void PostSuccessRun(
     const DownloadFile::InitializeCallback& initialize_callback,
     const DownloadFile::CancelRequestCallback& cancel_request_callback,
     const DownloadItem::ReceivedSlices& received_slices,
     bool is_parallelizable) {
-  initialize_callback.Run(DOWNLOAD_INTERRUPT_REASON_NONE);
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+                          base::Bind(&SuccessRun, initialize_callback));
 }
 
 }  // namespace
 
 MockDownloadFile::MockDownloadFile() {
   // This is here because |Initialize()| is normally called right after
   // construction.
   ON_CALL(*this, Initialize(_, _, _, _))
-      .WillByDefault(::testing::Invoke(SuccessRun));
+      .WillByDefault(::testing::Invoke(PostSuccessRun));
 }
 
 MockDownloadFile::~MockDownloadFile() {
 }
 
 void MockDownloadFile::AddByteStream(
     std::unique_ptr<ByteStreamReader> stream_reader,
     int64_t offset,
     int64_t length) {
   // Gmock currently can't mock method that takes move-only parameters,
   // delegate the EXPECT_CALL count to |DoAddByteStream|.
   DoAddByteStream(stream_reader.get(), offset, length);
 }
 
 }  // namespace content