Replace use of logging::DEBUG_MODE with DCHECK_IS_ON().

components/sync/base/logging.h

 // 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.
 
 #ifndef COMPONENTS_SYNC_BASE_LOGGING_H_
 #define COMPONENTS_SYNC_BASE_LOGGING_H_
 
 #include "base/logging.h"
 
 // TODO(akalin): This probably belongs in base/ somewhere.
 
 namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
 namespace syncer {
 
 bool VlogIsOnForLocation(const tracked_objects::Location& from_here,
                          int verbose_level);
 
 }  // namespace syncer
 
 #define VLOG_LOC_STREAM(from_here, verbose_level)                     \
   logging::LogMessage(from_here.file_name(), from_here.line_number(), \
                       -verbose_level)                                 \
       .stream()
 
 #define DVLOG_LOC(from_here, verbose_level)              \
   LAZY_STREAM(VLOG_LOC_STREAM(from_here, verbose_level), \
-              ::logging::DEBUG_MODE &&                   \
+              DCHECK_IS_ON() &&                          \
                   (VLOG_IS_ON(verbose_level) ||          \
                    ::syncer::VlogIsOnForLocation(from_here, verbose_level)))
 
 #endif  // COMPONENTS_SYNC_BASE_LOGGING_H_