ppapi: Use stl utilities from the base namespace

ppapi/proxy/file_system_resource.cc

 // Copyright (c) 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 "ppapi/proxy/file_system_resource.h"
 
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "ipc/ipc_message.h"
 #include "ppapi/c/pp_errors.h"
@@ skipping 77 matching lines @@
                  this,
                  callback));
   return PP_OK_COMPLETIONPENDING;
 }
 
 PP_FileSystemType FileSystemResource::GetType() {
   return type_;
 }
 
 void FileSystemResource::OpenQuotaFile(PP_Resource file_io) {
-  DCHECK(!ContainsKey(files_, file_io));
+  DCHECK(!base::ContainsKey(files_, file_io));
   files_.insert(file_io);
 }
 
 void FileSystemResource::CloseQuotaFile(PP_Resource file_io) {
-  DCHECK(ContainsKey(files_, file_io));
+  DCHECK(base::ContainsKey(files_, file_io));
   files_.erase(file_io);
 }
 
 int64_t FileSystemResource::RequestQuota(
     int64_t amount,
     const RequestQuotaCallback& callback) {
   DCHECK(amount >= 0);
   if (!reserving_quota_ && reserved_quota_ >= amount) {
     reserved_quota_ -= amount;
     return amount;
@@ skipping 118 matching lines @@
       // Refresh the quota reservation for the first pending request that we
       // can't satisfy.
       ReserveQuota(request.amount);
       break;
     }
   }
 }
 
 }  // namespace proxy
 }  // namespace ppapi