Fix device broadcast DCHECK.

content/browser/system_message_window_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/system_message_window_win.h"
 
 #include <dbt.h>
 #include <ks.h>
 #include <ksmedia.h>
 
@@ skipping 93 matching lines @@
 
     case DBT_DEVICEREMOVECOMPLETE:
     case DBT_DEVICEARRIVAL: {
       // This notification has more details about the specific device that
       // was added or removed.  See if this is a category we're interested
       // in monitoring and if so report the specific device type.  If we don't
       // find the category in our map, ignore the notification and do not
       // notify the system monitor.
       DEV_BROADCAST_DEVICEINTERFACE* device_interface =
           reinterpret_cast<DEV_BROADCAST_DEVICEINTERFACE*>(data);
-      DCHECK_EQ(device_interface->dbcc_devicetype,
-                static_cast<DWORD>(DBT_DEVTYP_DEVICEINTERFACE));
+      if (device_interface->dbcc_devicetype != DBT_DEVTYP_DEVICEINTERFACE)
+        return TRUE;
       for (int i = 0; i < arraysize(kDeviceCategoryMap); ++i) {
         if (kDeviceCategoryMap[i].device_category ==
             device_interface->dbcc_classguid) {
           device_type = kDeviceCategoryMap[i].device_type;
           break;
         }
       }
 
       // Devices that we do not have a DEVTYPE_ for, get detected via
       // DBT_DEVNODES_CHANGED, so we avoid sending additional notifications
@@ skipping 16 matching lines @@
                                                  WPARAM wparam, LPARAM lparam) {
   switch (message) {
     case WM_DEVICECHANGE:
       return OnDeviceChange(static_cast<UINT>(wparam), lparam);
     default:
       break;
   }
 
   return ::DefWindowProc(hwnd, message, wparam, lparam);
 }