Replace base::str[n]casecmp with helper functions.

chrome/service/cloud_print/cloud_print_proxy_backend.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 "chrome/service/cloud_print/cloud_print_proxy_backend.h"
 
 #include <map>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 532 matching lines @@
 
 
 void CloudPrintProxyBackend::Core::OnIncomingNotification(
     const notifier::Notification& notification) {
   // Since we got some notification from the server,
   // reset pending ping counter to 0.
   pending_xmpp_pings_ = 0;
 
   DCHECK(base::MessageLoop::current() == backend_->core_thread_.message_loop());
   VLOG(1) << "CP_CONNECTOR: Incoming notification.";
-  if (0 == base::strcasecmp(kCloudPrintPushNotificationsSource,
-                            notification.channel.c_str()))
+  if (base::EqualsCaseInsensitiveASCII(kCloudPrintPushNotificationsSource,
+                                       notification.channel))
     HandlePrinterNotification(notification.data);
 }
 
 void CloudPrintProxyBackend::Core::OnPingResponse() {
   UMA_HISTOGRAM_COUNTS_100("CloudPrint.XmppPingTry", pending_xmpp_pings_);
   pending_xmpp_pings_ = 0;
   VLOG(1) << "CP_CONNECTOR: Ping response received.";
 }
 
 }  // namespace cloud_print