When the download folder does not exist, change the download folder to a user's "Downloads"

chrome/browser/download/download_file_manager.cc

 // Copyright (c) 2011 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/download/download_file_manager.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/task.h"
@@ skipping 259 matching lines @@
   }
 }
 
 // Actions from the UI thread and run on the download thread
 
 // The DownloadManager in the UI thread has provided an intermediate .crdownload
 // name for the download specified by 'id'. Rename the in progress download.
 //
 // There are 2 possible rename cases where this method can be called:
 // 1. tmp -> foo.crdownload (not final, safe)
-// 2. tmp-> Unconfirmed.xxx.crdownload (not final, dangerous)
+// 2. tmp -> Unconfirmed.xxx.crdownload (not final, dangerous)
 void DownloadFileManager::RenameInProgressDownloadFile(
     int id, const FilePath& full_path) {
   VLOG(20) << __FUNCTION__ << "()" << " id = " << id
            << " full_path = \"" << full_path.value() << "\"";
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 
   DownloadFile* download_file = GetDownloadFile(id);
   if (!download_file)
     return;
 
@@ skipping 104 matching lines @@
            << " id = " << id
            << " download_file = " << download_file->DebugString();
 
   downloads_.erase(id);
 
   delete download_file;
 
   if (downloads_.empty())
     StopUpdateTimer();
 }