Replace ToLower calls to the new format

cloud_print/gcp20/prototype/print_job_handler.cc

 // Copyright 2013 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 "cloud_print/gcp20/prototype/print_job_handler.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/format_macros.h"
@@ skipping 17 matching lines @@
 const int kTooManyDraftsTimeout = 10;
 const size_t kMaxDrafts = 5;
 
 const base::FilePath::CharType kJobsPath[] = FILE_PATH_LITERAL("printjobs");
 
 bool ValidateTicket(const std::string& ticket) {
   return true;
 }
 
 std::string GenerateId() {
-  return base::StringToLowerASCII(base::GenerateGUID());
+  return base::ToLowerASCII(base::GenerateGUID());
 }
 
 }  // namespace
 
 struct PrintJobHandler::LocalPrintJobExtended {
   LocalPrintJobExtended(const LocalPrintJob& job, const std::string& ticket)
       : data(job),
         ticket(ticket),
         state(LocalPrintJob::STATE_DRAFT) {}
   LocalPrintJobExtended() : state(LocalPrintJob::STATE_DRAFT) {}
@@ skipping 252 matching lines @@
   return expiration - base::Time::Now();
 }
 
 void PrintJobHandler::ForgetDraft(const std::string& id) {
   drafts.erase(id);
 }
 
 void PrintJobHandler::ForgetLocalJob(const std::string& id) {
   jobs.erase(id);
 }