Fixed all unused-variable Clang warnings on Windows.

content/browser/download/base_file_win.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/base_file.h"
 
 #include <windows.h>
 #include <cguid.h>
 #include <objbase.h>
 #include <shellapi.h>
@@ skipping 320 matching lines @@
   source.append(1, L'\0');
   target.append(1, L'\0');
 
   SHFILEOPSTRUCT move_info = {0};
   move_info.wFunc = FO_MOVE;
   move_info.pFrom = source.c_str();
   move_info.pTo = target.c_str();
   move_info.fFlags = FOF_SILENT | FOF_NOCONFIRMATION | FOF_NOERRORUI |
       FOF_NOCONFIRMMKDIR | FOF_NOCOPYSECURITYATTRIBS;
 
-  base::TimeTicks now = base::TimeTicks::Now();
   int result = SHFileOperation(&move_info);
   DownloadInterruptReason interrupt_reason = DOWNLOAD_INTERRUPT_REASON_NONE;
 
   if (result == 0 && move_info.fAnyOperationsAborted)
     interrupt_reason = DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
   else if (result != 0)
     interrupt_reason = MapShFileOperationCodes(result);
 
   if (interrupt_reason != DOWNLOAD_INTERRUPT_REASON_NONE)
     return LogInterruptReason("SHFileOperation", result, interrupt_reason);
@@ skipping 35 matching lines @@
       RecordDownloadCount(FILE_MISSING_AFTER_SUCCESSFUL_SCAN_COUNT);
       result = DOWNLOAD_INTERRUPT_REASON_FILE_SECURITY_CHECK_FAILED;
     }
     LogInterruptReason("ScanAndSaveDownloadedFile", hr, result);
   }
   bound_net_log_.EndEvent(net::NetLog::TYPE_DOWNLOAD_FILE_ANNOTATED);
   return result;
 }
 
 }  // namespace content