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

net/base/x509_certificate_win.cc

 // Copyright (c) 2006-2008 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/base/x509_certificate.h"
 
 #include "base/crypto/rsa_private_key.h"
 #include "base/crypto/scoped_capi_types.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 387 matching lines @@
 
   // We don't expect to have more than one CN, L, S, and C.
   std::vector<std::string>* single_value_lists[4] = {
       &common_names, &locality_names, &state_names, &country_names };
   std::string* single_values[4] = {
       &principal->common_name, &principal->locality_name,
       &principal->state_or_province_name, &principal->country_name };
   for (int i = 0; i < arraysize(single_value_lists); ++i) {
     int length = static_cast<int>(single_value_lists[i]->size());
     DCHECK(single_value_lists[i]->size() <= 1);
-    if (single_value_lists[i]->size() > 0)
+    if (!single_value_lists[i]->empty())
       *(single_values[i]) = (*(single_value_lists[i]))[0];
   }
 }
 
 void AddCertsFromStore(HCERTSTORE store,
                        X509Certificate::OSCertHandles* results) {
   PCCERT_CONTEXT cert = NULL;
 
   while ((cert = CertEnumCertificatesInStore(store, cert)) != NULL) {
     PCCERT_CONTEXT to_add = NULL;
@@ skipping 552 matching lines @@
   DWORD sha1_size = sizeof(sha1.data);
   rv = CryptHashCertificate(NULL, CALG_SHA1, 0, cert->pbCertEncoded,
                             cert->cbCertEncoded, sha1.data, &sha1_size);
   DCHECK(rv && sha1_size == sizeof(sha1.data));
   if (!rv)
     memset(sha1.data, 0, sizeof(sha1.data));
   return sha1;
 }
 
 }  // namespace net