Downloads: replace BrowserThread::FILE with task scheduler.

content/browser/download/base_file_win.cc

Index: content/browser/download/base_file_win.cc
diff --git a/content/browser/download/base_file_win.cc b/content/browser/download/base_file_win.cc
index 53b109d44a2458014520a6c65c13d4055d2f6c10..9358bd06e946f47d8a576840e7d9b35310424b94 100644
--- a/content/browser/download/base_file_win.cc
+++ b/content/browser/download/base_file_win.cc
@@ -16,6 +16,7 @@
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
+#include "base/win/scoped_com_initializer.h"
 #include "content/browser/download/download_interrupt_reasons_impl.h"
 #include "content/browser/download/download_stats.h"
 #include "content/public/browser/browser_thread.h"
@@ -296,6 +297,10 @@ DownloadInterruptReason BaseFile::MoveFileAndAdjustPermissions(
     const base::FilePath& new_path) {
   base::ThreadRestrictions::AssertIOAllowed();
 
+  // TODO(siggi): This is pretty awkward, but at least better than forcing
+  //     all downloads to a single-threaded COM sequence runner.
+  base::win::ScopedCOMInitializer com_initializer;
+
   // The parameters to SHFileOperation must be terminated with 2 NULL chars.
   base::FilePath::StringType source = full_path_.value();
   base::FilePath::StringType target = new_path.value();