Change other usages of .size() to .empty() when applicable.

net/url_request/url_request_job_tracker.cc

 // Copyright (c) 2010 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 "net/url_request/url_request_job_tracker.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "net/url_request/url_request_job.h"
 
 namespace net {
 
 URLRequestJobTracker g_url_request_job_tracker;
 
 URLRequestJobTracker::URLRequestJobTracker() {
 }
 
 URLRequestJobTracker::~URLRequestJobTracker() {
-  DLOG_IF(WARNING, active_jobs_.size() != 0) <<
+  DLOG_IF(WARNING, !active_jobs_.empty()) <<
     "Leaking " << active_jobs_.size() << " URLRequestJob object(s), this "
     "could be because the URLRequest forgot to free it (bad), or if the "
     "program was terminated while a request was active (normal).";
 }
 
 void URLRequestJobTracker::AddNewJob(URLRequestJob* job) {
   active_jobs_.push_back(job);
   FOR_EACH_OBSERVER(JobObserver, observers_, OnJobAdded(job));
 }
 
@@ skipping 22 matching lines @@
 }
 
 void URLRequestJobTracker::OnBytesRead(URLRequestJob* job,
                                        const char* buf,
                                        int byte_count) {
   FOR_EACH_OBSERVER(JobObserver, observers_,
                     OnBytesRead(job, buf, byte_count));
 }
 
 }  // namespace net